DoS
Netherlands: Citrix Netscaler flaw CVE-2025-6543 exploited to breach orgs
The Netherlands’ National Cyber Security Centre (NCSC) is warning that a critical Citrix NetScaler vulnerability tracked as CVE-2025-6543 was exploited to breach “critical organizations” in the country. The critical flaw is a memory overflow bug that allows unintended control flow or a denial of service state on impacted devices. “Memory overflow vulnerability leading to unintended control […]
Apple ‘AirBorne’ flaws can lead to zero-click AirPlay RCE attacks
A set of security vulnerabilities in Apple’s AirPlay Protocol and AirPlay Software Development Kit (SDK) exposed unpatched third-party and Apple devices to various attacks, including remote code execution. According to cybersecurity company Oligo Security security researchers who discovered and reported the flaws, they can be exploited in zero-click and one-click RCE attacks, man-in-the-middle (MITM) attacks, […]
Cisco IOS XR vulnerability lets attackers crash BGP on routers
Cisco has patched a denial of service (DoS) vulnerability that lets attackers crash the Border Gateway Protocol (BGP) process on IOS XR routers with a single BGP update message. IOS XR runs on the company’s carrier-grade, Network Convergence System (NCS), and Carrier Routing System (CRS) series of routers, such as the ASR 9000, NCS 5500, and 8000 series. This high-severity flaw (tracked […]
New OpenSSH flaws expose SSH servers to MiTM and DoS attacks
OpenSSH has released security updates addressing two vulnerabilities, a machine-in-the-middle (MitM) and a denial of service flaw, with one of the flaws introduced over a decade ago. Qualys discovered both vulnerabilities and demonstrated their exploitability to OpenSSH’s maintainers. OpenSSH (Open Secure Shell) is a free, open-source implementation of the SSH (Secure Shell) protocol, which provides […]
Cisco warns of denial of service flaw with PoC exploit code
Cisco has released security updates to patch a ClamAV denial-of-service (DoS) vulnerability, which has proof-of-concept (PoC) exploit code. Tracked as CVE-2025-20128, the vulnerability is caused by a heap-based buffer overflow weakness in the Object Linking and Embedding 2 (OLE2) decryption routine, allowing unauthenticated, remote attackers to trigger a DoS condition on vulnerable devices. If this vulnerability is […]