CVE-2025-20271
HighSummary
Podatność w serwerze VPN Cisco AnyConnect urządzeń Cisco Meraki MX i Z Series Teleworker Gateway może umożliwić nieautoryzowanemu, zdalnemu atakującemu spowodowanie stanu odmowy usługi (DoS) w usłudze Cisco AnyConnect. Wykorzystanie tej podatności polega na wysyłaniu odpowiednio skonstruowanych żądań HTTPS do urządzenia.
Risk Assessment
Atakujący może spowodować restart serwera VPN Cisco AnyConnect, co skutkuje przerwaniem wszystkich aktywnych sesji SSL VPN i zmuszeniem użytkowników do ponownego nawiązania połączenia. Długotrwały atak może uniemożliwić nawiązywanie nowych połączeń SSL VPN, co czyni usługę niedostępną dla wszystkich uprawnionych użytkowników.
Recommendation
Zaleca się aktualizację urządzeń Cisco Meraki do najnowszej wersji oprogramowania, aby załatać tę podatność. Dodatkowo, monitorowanie ruchu sieciowego w celu wykrywania nietypowych wzorców może pomóc w zapobieganiu atakom.
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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 Teleworker Gateway devices could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition in the Cisco AnyConnect service on an affected device. This vulnerability is due to variable initialization errors when an SSL VPN session is established. An attacker could exploit this vulnerability by sending a sequence of crafted HTTPS requests to an affected device. A successful exploit could allow the attacker to cause the Cisco AnyConnect VPN server to restart, resulting in the failure of all established SSL VPN sessions and forcing remote users to initiate a new VPN connection and re-authenticate. A sustained attack could prevent new SSL VPN connections from being established, effectively making the Cisco AnyConnect VPN service unavailable for all legitimate users.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS