Denial of Service
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 […]
Cloudflare mitigated a record-breaking 5.6 Tbps DDoS attack
The largest distributed denial-of-service (DDoS) attack to date peaked at 5.6 terabits per second and came from a Mirai-based botnet with 13,000 compromised devices. The UDP-based attack occurred last year on October 29 and targeted an internet service provider (ISP) in Eastern Asia in an attempt to bring its services offline. Security and connectivity services provider […]
Hackers exploit DoS flaw to disable Palo Alto Networks firewalls
Palo Alto Networks is warning that hackers are exploiting the CVE-2024-3393 denial of service vulnerability to disable firewall protections by forcing it to reboot. Leveraging the security issue repeatedly, however, causes the device to enter maintenance mode and manual intervention is required to restore it to normal operations. “A Denial of Service vulnerability in the DNS […]
Korea arrests CEO for adding DDoS feature to satellite receivers
South Korean police have arrested a CEO and five employees for manufacturing over 240,000 satellite receivers pre-loaded or later updated to include DDoS attack functionality at a purchaser’s request. While neither company has been named, the two companies have been trading since 2017. In November 2018, the purchasing company made a special request to include […]
Dutch police arrest admin of ‘Bohemia/Cannabia’ dark web market
An international law enforcement operation led to the arrest of one of the three administrators of the dual dark web market ‘Bohemia/Cannabia,’ known for hosting ads for drug sales and distributed denial of service (DDoS) attacks. The man was arrested at the Schiphol airport in Amsterdam on June 27, 2024, and electronic devices containing incriminating […]
Microsoft October 2024 Patch Tuesday fixes 5 zero-days, 118 flaws
Microsoft October 2024 Patch Tuesday, which includes security updates for 118 flaws, including five publicly disclosed zero-days, two of which are actively exploited. This Patch Tuesday fixed three critical vulnerabilities, all remote code execution flaws. The number of bugs in each vulnerability category is listed below: This count does not include three Edge flaws that […]
Recently patched CUPS flaw can be used to amplify DDoS attacks
A recently disclosed vulnerability in the Common Unix Printing System (CUPS) open-source printing system can be exploited by threat actors to launch distributed denial-of-service (DDoS) attacks with a 600x amplification factor. As Akamai security researchers found, a CVE-2024-47176 security flaw in the cups-browsed daemon that can be chained with three other bugs to gain remote code execution […]
Cloudflare blocks largest recorded DDoS attack peaking at 3.8Tbps
During a distributed denial-of-service campaign targeting organizations in the financial services, internet, and telecommunications sectors, volumetric attacks peaked at 3.8 terabits per second, the largest publicly recorded to date. The assault consisted of a “month-long” barrage of more than 100 hyper-volumetric DDoS attacks flooding the network infrastructure with garbage data. In a volumetric DDoS attack, […]