CVE-2025-20212
HighSummary
Podatność w serwerze VPN Cisco AnyConnect na urządzeniach Cisco Meraki MX i Z Series może pozwolić uwierzytelnionemu, zdalnemu atakującemu na spowodowanie stanu odmowy usługi (DoS) w usłudze Cisco AnyConnect. Wykorzystanie tej podatności wymaga posiadania ważnych poświadczeń użytkownika VPN na zaatakowanym urządzeniu.
Risk Assessment
Atakujący może zrestartować serwer VPN Cisco AnyConnect, co prowadzi do przerwania istniejących sesji SSL VPN i zmusza użytkowników do ponownego nawiązania połączenia oraz uwierzytelnienia. Długotrwały atak może uniemożliwić nawiązywanie nowych połączeń SSL VPN.
Recommendation
Zaleca się monitorowanie i ograniczenie dostępu do serwera VPN oraz regularne aktualizowanie oprogramowania, aby zminimalizować ryzyko wykorzystania tej podatności.
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Original NVD description (English source)
A vulnerability in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series devices could allow an authenticated, remote attacker to cause a denial of service (DoS) condition in the Cisco AnyConnect service on an affected device. To exploit this vulnerability, the attacker must have valid VPN user credentials on the affected device. This vulnerability exists because a variable is not initialized when an SSL VPN session is established. An attacker could exploit this vulnerability by supplying crafted attributes while establishing an SSL VPN session with an affected device. A successful exploit could allow the attacker to cause the Cisco AnyConnect VPN server to restart, resulting in the failure of the established SSL VPN sessions and forcing remote users to initiate a new VPN connection and reauthenticate. A sustained attack could prevent new SSL VPN connections from being established. Note: When the attack traffic stops, the Cisco AnyConnect VPN server recover
Vulnerability data from NVD (NIST) · CISA KEV · EPSS