CVE-2023-20269

Cisco ASA and Firepower Threat Defense suffered an unpatched unauthorized access vulnerability allowing remote brute-force attacks and clientless SSL VPN sessions.

The vulnerability allowed unauthenticated remote attackers to brute-force credentials or establish unauthorized clientless SSL VPN sessions, directly enabling ransomware-linked attacks. DIB organizations must ensure all Cisco ASA and Firepower Threat Defense systems are patched immediately to prevent credential theft and unauthorized network access. This failure highlights the severe risk of relying on unpatched, actively exploited vulnerabilities in critical network security hardware.

Shame score — The vulnerability was actively exploited in the wild and linked to ransomware, demonstrating a severe failure to patch known, critical flaws in widely deployed security hardware.