Microsoft January 2025 Patch Tuesday fixes 8 zero-days, 159 flaws
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Microsoft January 2025 Patch Tuesday fixes 8 zero-days, 159 flaws

Today is Microsoft’s January 2025 Patch Tuesday, which includes security updates for 159 flaws, including eight zero-day vulnerabilities, with three actively exploited in attacks.

This Patch Tuesday also fixes twelve “Critical” vulnerabilities, including information disclosure, privileges elevation, and remote code execution flaws.

The number of bugs in each vulnerability category is listed below:

  • 40 Elevation of Privilege Vulnerabilities
  • 14 Security Feature Bypass Vulnerabilities
  • 58 Remote Code Execution Vulnerabilities
  • 24 Information Disclosure Vulnerabilities
  • 20 Denial of Service Vulnerabilities
  • 5 Spoofing Vulnerabilities

To learn more about the non-security updates released today, you can review our dedicated articles on the Windows 11 KB5050009 & KB5050021 cumulative updates and the Windows 10 KB5048652 cumulative update.

Three actively exploited zero-day disclosed

This month’s Patch Tuesday fixes three actively exploited and five publicly exposed zero-day vulnerabilities.

Microsoft classifies a zero-day flaw as one that is publicly disclosed or actively exploited while no official fix is available.

The actively exploited zero-day vulnerability in today’s updates are:

CVE-2025-21333CVE-2025-21334CVE-2025-21335 – Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability

Microsoft has fixed three elevation of privilege vulnerability in Windows Hyper-V that were exploited in attacks to gain SYSTEM privileges on Windows devices.

No information has been released as to how these flaws were exploited in attacks, and they all show that they were disclosed anonymously.

As the CVEs for these three vulnerabilities are sequential and for the same feature, they were all likely found used or discovered through the same attacks.

The publicly disclosed zero-days are:

CVE-2025-21275 – Windows App Package Installer Elevation of Privilege Vulnerability

Microsoft fixed an elevation of privileges flaw in the Windows App Package Installer that could lead to SYSTEM privileges.

“An attacker who successfully exploited this vulnerability could gain SYSTEM privileges,” explains Microsoft’s advisory.

The vulnerability was submitted anonymously to Microsoft.

CVE-2025-21308 – Windows Themes Spoofing Vulnerability

Microsoft fixed a Windows Theme vulnerability that could be exploited simply by displaying a specially crafted Theme file in Windows Explorer.

“An attacker would have to convince the user to load a malicious file onto a vulnerable system, typically by way of an enticement in an Email or Instant Messenger message, and then convince the user to manipulate the specially crafted file, but not necessarily click or open the malicious file.,” explains Microsoft’s advisory.

The flaw was discovered by Blaz Satler with 0patch by ACROS Security, which is a bypass of a previous flaw tracked as CVE-2024-38030. 0patch previously released micropatches for this flaw in October, while waiting for Microsoft to fix it.

When a Theme file is viewed in Windows Explorer and utilizes BrandImage and Wallpaper options that specify a network file path, Windows automatically sends authentication requests to the remote host, including the logged-in user’s NTLM credentials.

These NTLM hashes can then be cracked to get the plain-text password or used in pass-the-hash attacks.

Microsoft says the flaw is mitigated if NTLM is disabled or the “Restrict NTLM: Outgoing NTLM traffic to remote servers” policy is enabled.

CVE-2025-21186,  CVE-2025-21366CVE-2025-21395 – Microsoft Access Remote Code Execution Vulnerability

Microsoft fixed three remote code execution vulnerabilities in Microsoft Access that are exploited when opening specially crafted Microsoft Access documents.

Microsoft has mitigated this issue by blocking access to the following Microsoft Access documents if they were sent via email:

  • accdb
  • accde
  • accdw
  • accdt
  • accda
  • accdr
  • accdu

What makes this interesting is that Unpatched.ai, an AI-assisted vulnerability discovery platform, has discovered all three flaws.

Recent updates from other companies

Other vendors who released updates or advisories in January 2025 include:

  • Adobe released security updates for Photoshop, Substance3D Stager and Designer, Adobe Illustrator for iPad, and Adobe Animate.
  • Cisco released security updates for multiple products, including Cisco ThousandEyes Endpoint Agent and Cisco Crosswork Network Controller.
  • Ivanti released security updates for a Connect Secure flaw zero-day exploited in attacks to deploy custom malware on devices.
  • Fortinet released a security update for an authentication bypass zero-day vulnerability in FortiOS and FortiProxy that was exploited in attacks since November.
  • GitHub released security updates for two Git vulnerabilities.
  • Moxa released security updates for high-severity and a critical vulnerabilities in its industrial networking and communications networking devices.
  • ProjectDiscovery released security updates in September for a Nuclei flaw that allows malicious templates to bypass signature verification.
  • SAP releases security updates for multiple products, including fixes for two critical (9.9/10) vulnerabilities in SAP NetWeaver.
  • SonicWall releases patches for an authentication bypass vulnerability in SSL VPN and SSH management that is “susceptible to actual exploitation.” 
  • Zyxel has released security updates to fix an improper privilege management vulnerability in the web management interface.

The January 2025 Patch Tuesday Security Updates

Below is the complete list of resolved vulnerabilities in the January 2025 Patch Tuesday updates.

To access the full description of each vulnerability and the systems it affects, you can view the full report here.

TagCVE IDCVE TitleSeverity
.NETCVE-2025-21171.NET Remote Code Execution VulnerabilityImportant
.NETCVE-2025-21173.NET Elevation of Privilege VulnerabilityImportant
.NET and Visual StudioCVE-2025-21172.NET and Visual Studio Remote Code Execution VulnerabilityImportant
.NET, .NET Framework, Visual StudioCVE-2025-21176.NET, .NET Framework, and Visual Studio Remote Code Execution VulnerabilityImportant
Active Directory Domain ServicesCVE-2025-21293Active Directory Domain Services Elevation of Privilege VulnerabilityImportant
Active Directory Federation ServicesCVE-2025-21193Active Directory Federation Server Spoofing VulnerabilityImportant
Azure Marketplace SaaS ResourcesCVE-2025-21380Azure Marketplace SaaS Resources Information Disclosure VulnerabilityCritical
BranchCacheCVE-2025-21296BranchCache Remote Code Execution VulnerabilityCritical
Internet ExplorerCVE-2025-21326Internet Explorer Remote Code Execution VulnerabilityImportant
IP HelperCVE-2025-21231IP Helper Denial of Service VulnerabilityImportant
Line Printer Daemon Service (LPD)CVE-2025-21224Windows Line Printer Daemon (LPD) Service Remote Code Execution VulnerabilityImportant
Microsoft AutoUpdate (MAU)CVE-2025-21360Microsoft AutoUpdate (MAU) Elevation of Privilege VulnerabilityImportant
Microsoft Azure Gateway ManagerCVE-2025-21403On-Premises Data Gateway Information Disclosure VulnerabilityImportant
Microsoft Brokering File SystemCVE-2025-21315Microsoft Brokering File System Elevation of Privilege VulnerabilityImportant
Microsoft Brokering File SystemCVE-2025-21372Microsoft Brokering File System Elevation of Privilege VulnerabilityImportant
Microsoft Digest AuthenticationCVE-2025-21294Microsoft Digest Authentication Remote Code Execution VulnerabilityCritical
Microsoft Graphics ComponentCVE-2025-21382Windows Graphics Component Elevation of Privilege VulnerabilityImportant
Microsoft OfficeCVE-2025-21346Microsoft Office Security Feature Bypass VulnerabilityImportant
Microsoft OfficeCVE-2025-21365Microsoft Office Remote Code Execution VulnerabilityImportant
Microsoft Office AccessCVE-2025-21186Microsoft Access Remote Code Execution VulnerabilityImportant
Microsoft Office AccessCVE-2025-21366Microsoft Access Remote Code Execution VulnerabilityImportant
Microsoft Office AccessCVE-2025-21395Microsoft Access Remote Code Execution VulnerabilityImportant
Microsoft Office ExcelCVE-2025-21364Microsoft Excel Security Feature Bypass VulnerabilityImportant
Microsoft Office ExcelCVE-2025-21362Microsoft Excel Remote Code Execution VulnerabilityCritical
Microsoft Office ExcelCVE-2025-21354Microsoft Excel Remote Code Execution VulnerabilityCritical
Microsoft Office OneNoteCVE-2025-21402Microsoft Office OneNote Remote Code Execution VulnerabilityImportant
Microsoft Office OutlookCVE-2025-21357Microsoft Outlook Remote Code Execution VulnerabilityImportant
Microsoft Office Outlook for MacCVE-2025-21361Microsoft Outlook Remote Code Execution VulnerabilityImportant
Microsoft Office SharePointCVE-2025-21344Microsoft SharePoint Server Remote Code Execution VulnerabilityImportant
Microsoft Office SharePointCVE-2025-21348Microsoft SharePoint Server Remote Code Execution VulnerabilityImportant
Microsoft Office SharePointCVE-2025-21393Microsoft SharePoint Server Spoofing VulnerabilityImportant
Microsoft Office VisioCVE-2025-21345Microsoft Office Visio Remote Code Execution VulnerabilityImportant
Microsoft Office VisioCVE-2025-21356Microsoft Office Visio Remote Code Execution VulnerabilityImportant
Microsoft Office WordCVE-2025-21363Microsoft Word Remote Code Execution VulnerabilityImportant
Microsoft PurviewCVE-2025-21385Microsoft Purview Information Disclosure VulnerabilityCritical
Microsoft Windows Search ComponentCVE-2025-21292Windows Search Service Elevation of Privilege VulnerabilityImportant
Power AutomateCVE-2025-21187Microsoft Power Automate Remote Code Execution VulnerabilityImportant
Reliable Multicast Transport Driver (RMCAST)CVE-2025-21307Windows Reliable Multicast Transport Driver (RMCAST) Remote Code Execution VulnerabilityCritical
Visual StudioCVE-2025-21405Visual Studio Elevation of Privilege VulnerabilityImportant
Visual StudioCVE-2024-50338GitHub: CVE-2024-50338 Malformed URL allows information disclosure through git-credential-managerImportant
Visual StudioCVE-2025-21178Visual Studio Remote Code Execution VulnerabilityImportant
Windows BitLockerCVE-2025-21213Secure Boot Security Feature Bypass VulnerabilityImportant
Windows BitLockerCVE-2025-21214Windows BitLocker Information Disclosure VulnerabilityImportant
Windows Boot LoaderCVE-2025-21211Secure Boot Security Feature Bypass VulnerabilityImportant
Windows Boot ManagerCVE-2025-21215Secure Boot Security Feature Bypass VulnerabilityImportant
Windows Client-Side Caching (CSC) ServiceCVE-2025-21374Windows CSC Service Information Disclosure VulnerabilityImportant
Windows Client-Side Caching (CSC) ServiceCVE-2025-21378Windows CSC Service Elevation of Privilege VulnerabilityImportant
Windows Cloud Files Mini Filter DriverCVE-2025-21271Windows Cloud Files Mini Filter Driver Elevation of Privilege VulnerabilityImportant
Windows COMCVE-2025-21281Microsoft COM for Windows Elevation of Privilege VulnerabilityImportant
Windows COMCVE-2025-21272Windows COM Server Information Disclosure VulnerabilityImportant
Windows COMCVE-2025-21288Windows COM Server Information Disclosure VulnerabilityImportant
Windows Connected Devices Platform ServiceCVE-2025-21207Windows Connected Devices Platform Service (Cdpsvc) Denial of Service VulnerabilityImportant
Windows Cryptographic ServicesCVE-2025-21336Windows Cryptographic Information Disclosure VulnerabilityImportant
Windows Digital MediaCVE-2025-21261Windows Digital Media Elevation of Privilege VulnerabilityImportant
Windows Digital MediaCVE-2025-21258Windows Digital Media Elevation of Privilege VulnerabilityImportant
Windows Digital MediaCVE-2025-21232Windows Digital Media Elevation of Privilege VulnerabilityImportant
Windows Digital MediaCVE-2025-21256Windows Digital Media Elevation of Privilege VulnerabilityImportant
Windows Digital MediaCVE-2025-21255Windows Digital Media Elevation of Privilege VulnerabilityImportant
Windows Digital MediaCVE-2025-21226Windows Digital Media Elevation of Privilege VulnerabilityImportant
Windows Digital MediaCVE-2025-21310Windows Digital Media Elevation of Privilege VulnerabilityImportant
Windows Digital MediaCVE-2025-21324Windows Digital Media Elevation of Privilege VulnerabilityImportant
Windows Digital MediaCVE-2025-21249Windows Digital Media Elevation of Privilege VulnerabilityImportant
Windows Digital MediaCVE-2025-21341Windows Digital Media Elevation of Privilege VulnerabilityImportant
Windows Digital MediaCVE-2025-21227Windows Digital Media Elevation of Privilege VulnerabilityImportant
Windows Digital MediaCVE-2025-21260Windows Digital Media Elevation of Privilege VulnerabilityImportant
Windows Digital MediaCVE-2025-21265Windows Digital Media Elevation of Privilege VulnerabilityImportant
Windows Digital MediaCVE-2025-21263Windows Digital Media Elevation of Privilege VulnerabilityImportant
Windows Digital MediaCVE-2025-21228Windows Digital Media Elevation of Privilege VulnerabilityImportant
Windows Digital MediaCVE-2025-21327Windows Digital Media Elevation of Privilege VulnerabilityImportant
Windows Digital MediaCVE-2025-21229Windows Digital Media Elevation of Privilege VulnerabilityImportant
Windows Direct ShowCVE-2025-21291Windows Direct Show Remote Code Execution VulnerabilityImportant
Windows DWM Core LibraryCVE-2025-21304Microsoft DWM Core Library Elevation of Privilege VulnerabilityImportant
Windows Event TracingCVE-2025-21274Windows Event Tracing Denial of Service VulnerabilityImportant
Windows Geolocation ServiceCVE-2025-21301Windows Geolocation Service Information Disclosure VulnerabilityImportant
Windows HelloCVE-2025-21340Windows Virtualization-Based Security (VBS) Security Feature Bypass VulnerabilityImportant
Windows Hyper-V NT Kernel Integration VSPCVE-2025-21335Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege VulnerabilityImportant
Windows Hyper-V NT Kernel Integration VSPCVE-2025-21334Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege VulnerabilityImportant
Windows Hyper-V NT Kernel Integration VSPCVE-2025-21333Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege VulnerabilityImportant
Windows InstallerCVE-2025-21275Windows App Package Installer Elevation of Privilege VulnerabilityImportant
Windows InstallerCVE-2025-21331Windows Installer Elevation of Privilege VulnerabilityImportant
Windows InstallerCVE-2025-21287Windows Installer Elevation of Privilege VulnerabilityImportant
Windows KerberosCVE-2025-21242Windows Kerberos Information Disclosure VulnerabilityImportant
Windows KerberosCVE-2025-21299Windows Kerberos Security Feature Bypass VulnerabilityImportant
Windows KerberosCVE-2025-21218Windows Kerberos Denial of Service VulnerabilityImportant
Windows Kernel MemoryCVE-2025-21316Windows Kernel Memory Information Disclosure VulnerabilityImportant
Windows Kernel MemoryCVE-2025-21318Windows Kernel Memory Information Disclosure VulnerabilityImportant
Windows Kernel MemoryCVE-2025-21321Windows Kernel Memory Information Disclosure VulnerabilityImportant
Windows Kernel MemoryCVE-2025-21320Windows Kernel Memory Information Disclosure VulnerabilityImportant
Windows Kernel MemoryCVE-2025-21317Windows Kernel Memory Information Disclosure VulnerabilityImportant
Windows Kernel MemoryCVE-2025-21319Windows Kernel Memory Information Disclosure VulnerabilityImportant
Windows Kernel MemoryCVE-2025-21323Windows Kernel Memory Information Disclosure VulnerabilityImportant
Windows MapUrlToZoneCVE-2025-21268MapUrlToZone Security Feature Bypass VulnerabilityImportant
Windows MapUrlToZoneCVE-2025-21269Windows HTML Platforms Security Feature Bypass VulnerabilityImportant
Windows MapUrlToZoneCVE-2025-21332MapUrlToZone Security Feature Bypass VulnerabilityImportant
Windows MapUrlToZoneCVE-2025-21276Windows MapUrlToZone Denial of Service VulnerabilityImportant
Windows MapUrlToZoneCVE-2025-21219MapUrlToZone Security Feature Bypass VulnerabilityImportant
Windows MapUrlToZoneCVE-2025-21328MapUrlToZone Security Feature Bypass VulnerabilityImportant
Windows MapUrlToZoneCVE-2025-21329MapUrlToZone Security Feature Bypass VulnerabilityImportant
Windows MapUrlToZoneCVE-2025-21189MapUrlToZone Security Feature Bypass VulnerabilityImportant
Windows Message QueuingCVE-2025-21251Microsoft Message Queuing (MSMQ) Denial of Service VulnerabilityImportant
Windows Message QueuingCVE-2025-21230Microsoft Message Queuing (MSMQ) Denial of Service VulnerabilityImportant
Windows Message QueuingCVE-2025-21220Microsoft Message Queuing Information Disclosure VulnerabilityImportant
Windows Message QueuingCVE-2025-21270Microsoft Message Queuing (MSMQ) Denial of Service VulnerabilityImportant
Windows Message QueuingCVE-2025-21285Microsoft Message Queuing (MSMQ) Denial of Service VulnerabilityImportant
Windows Message QueuingCVE-2025-21290Microsoft Message Queuing (MSMQ) Denial of Service VulnerabilityImportant
Windows Message QueuingCVE-2025-21289Microsoft Message Queuing (MSMQ) Denial of Service VulnerabilityImportant
Windows Message QueuingCVE-2025-21277Microsoft Message Queuing (MSMQ) Denial of Service VulnerabilityImportant
Windows NTLMCVE-2025-21217Windows NTLM Spoofing VulnerabilityImportant
Windows NTLMCVE-2025-21311Windows NTLM V1 Elevation of Privilege VulnerabilityCritical
Windows OLECVE-2025-21298Windows OLE Remote Code Execution VulnerabilityCritical
Windows PrintWorkflowUserSvcCVE-2025-21235Windows PrintWorkflowUserSvc Elevation of Privilege VulnerabilityImportant
Windows PrintWorkflowUserSvcCVE-2025-21234Windows PrintWorkflowUserSvc Elevation of Privilege VulnerabilityImportant
Windows Recovery Environment AgentCVE-2025-21202Windows Recovery Environment Agent Elevation of Privilege VulnerabilityImportant
Windows Remote Desktop ServicesCVE-2025-21309Windows Remote Desktop Services Remote Code Execution VulnerabilityCritical
Windows Remote Desktop ServicesCVE-2025-21297Windows Remote Desktop Services Remote Code Execution VulnerabilityCritical
Windows Remote Desktop ServicesCVE-2025-21225Windows Remote Desktop Gateway (RD Gateway) Denial of Service VulnerabilityImportant
Windows Remote Desktop ServicesCVE-2025-21330Windows Remote Desktop Services Denial of Service VulnerabilityImportant
Windows Remote Desktop ServicesCVE-2025-21278Windows Remote Desktop Gateway (RD Gateway) Denial of Service VulnerabilityImportant
Windows Secure BootCVE-2024-7344Cert CC: CVE-2024-7344 Howyar Taiwan Secure Boot BypassImportant
Windows Security Account ManagerCVE-2025-21313Windows Security Account Manager (SAM) Denial of Service VulnerabilityImportant
Windows Smart CardCVE-2025-21312Windows Smart Card Reader Information Disclosure VulnerabilityImportant
Windows SmartScreenCVE-2025-21314Windows SmartScreen Spoofing VulnerabilityImportant
Windows SPNEGO Extended NegotiationCVE-2025-21295SPNEGO Extended Negotiation (NEGOEX) Security Mechanism Remote Code Execution VulnerabilityCritical
Windows Telephony ServiceCVE-2025-21243Windows Telephony Service Remote Code Execution VulnerabilityImportant
Windows Telephony ServiceCVE-2025-21244Windows Telephony Service Remote Code Execution VulnerabilityImportant
Windows Telephony ServiceCVE-2025-21241Windows Telephony Service Remote Code Execution VulnerabilityImportant
Windows Telephony ServiceCVE-2025-21303Windows Telephony Service Remote Code Execution VulnerabilityImportant
Windows Telephony ServiceCVE-2025-21246Windows Telephony Service Remote Code Execution VulnerabilityImportant
Windows Telephony ServiceCVE-2025-21252Windows Telephony Service Remote Code Execution VulnerabilityImportant
Windows Telephony ServiceCVE-2025-21417Windows Telephony Service Remote Code Execution VulnerabilityImportant
Windows Telephony ServiceCVE-2025-21248Windows Telephony Service Remote Code Execution VulnerabilityImportant
Windows Telephony ServiceCVE-2025-21306Windows Telephony Service Remote Code Execution VulnerabilityImportant
Windows Telephony ServiceCVE-2025-21233Windows Telephony Service Remote Code Execution VulnerabilityImportant
Windows Telephony ServiceCVE-2025-21411Windows Telephony Service Remote Code Execution VulnerabilityImportant
Windows Telephony ServiceCVE-2025-21413Windows Telephony Service Remote Code Execution VulnerabilityImportant
Windows Telephony ServiceCVE-2025-21237Windows Telephony Service Remote Code Execution VulnerabilityImportant
Windows Telephony ServiceCVE-2025-21239Windows Telephony Service Remote Code Execution VulnerabilityImportant
Windows Telephony ServiceCVE-2025-21339Windows Telephony Service Remote Code Execution VulnerabilityImportant
Windows Telephony ServiceCVE-2025-21236Windows Telephony Service Remote Code Execution VulnerabilityImportant
Windows Telephony ServiceCVE-2025-21245Windows Telephony Service Remote Code Execution VulnerabilityImportant
Windows Telephony ServiceCVE-2025-21409Windows Telephony Service Remote Code Execution VulnerabilityImportant
Windows Telephony ServiceCVE-2025-21223Windows Telephony Service Remote Code Execution VulnerabilityImportant
Windows Telephony ServiceCVE-2025-21282Windows Telephony Service Remote Code Execution VulnerabilityImportant
Windows Telephony ServiceCVE-2025-21305Windows Telephony Service Remote Code Execution VulnerabilityImportant
Windows Telephony ServiceCVE-2025-21273Windows Telephony Service Remote Code Execution VulnerabilityImportant
Windows Telephony ServiceCVE-2025-21266Windows Telephony Service Remote Code Execution VulnerabilityImportant
Windows Telephony ServiceCVE-2025-21250Windows Telephony Service Remote Code Execution VulnerabilityImportant
Windows Telephony ServiceCVE-2025-21302Windows Telephony Service Remote Code Execution VulnerabilityImportant
Windows Telephony ServiceCVE-2025-21240Windows Telephony Service Remote Code Execution VulnerabilityImportant
Windows Telephony ServiceCVE-2025-21286Windows Telephony Service Remote Code Execution VulnerabilityImportant
Windows Telephony ServiceCVE-2025-21238Windows Telephony Service Remote Code Execution VulnerabilityImportant
Windows ThemesCVE-2025-21308Windows Themes Spoofing VulnerabilityImportant
Windows UPnP Device HostCVE-2025-21300Windows upnphost.dll Denial of Service VulnerabilityImportant
Windows UPnP Device HostCVE-2025-21389Windows upnphost.dll Denial of Service VulnerabilityImportant
Windows Virtual Trusted Platform ModuleCVE-2025-21210Windows BitLocker Information Disclosure VulnerabilityImportant
Windows Virtual Trusted Platform ModuleCVE-2025-21284Windows Virtual Trusted Platform Module Denial of Service VulnerabilityImportant
Windows Virtual Trusted Platform ModuleCVE-2025-21280Windows Virtual Trusted Platform Module Denial of Service VulnerabilityImportant
Windows Virtualization-Based Security (VBS) EnclaveCVE-2025-21370Windows Virtualization-Based Security (VBS) Enclave Elevation of Privilege VulnerabilityImportant
Windows Web Threat Defense User ServiceCVE-2025-21343Windows Web Threat Defense User Service Information Disclosure VulnerabilityImportant
Windows Win32K – GRFXCVE-2025-21338GDI+ Remote Code Execution VulnerabilityImportant
Windows WLAN Auto Config ServiceCVE-2025-21257Windows WLAN AutoConfig Service Information Disclosure VulnerabilityImportant

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