Actively exploited in the wild
Cisco IOS and IOS XE Software Internet Key Exchange Denial-of-Service Vulnerability
Cisco - IOS and IOS XE Software · Listed in the CISA KEV since 2022-03-03. This indicates confirmed attacks in production environments.
Required action: Apply updates per vendor instructions.
CVE-2017-12237
HighCVSS 7.5KEVSummary
Podatność w module IKEv2 Cisco IOS w wersjach od 15.0 do 15.6 oraz Cisco IOS XE od 3.5 do 16.5 może pozwolić nieautoryzowanemu, zdalnemu atakującemu na spowodowanie wysokiego wykorzystania CPU, generowanie komunikatów traceback lub ponowne uruchomienie urządzenia, co prowadzi do stanu odmowy usługi (DoS). Problem wynika z przetwarzania określonych pakietów IKEv2 przez podatne urządzenie.
Risk Assessment
Ryzyko dla organizacji polega na możliwości wystąpienia stanu odmowy usługi, co może prowadzić do przerwy w działaniu krytycznych usług sieciowych. Atakujący może wykorzystać tę podatność do destabilizacji infrastruktury sieciowej.
Recommendation
Zaleca się aktualizację oprogramowania Cisco do najnowszej wersji, w której ta podatność została załatana, oraz monitorowanie ruchu IKEv2 w celu wykrywania potencjalnych prób ataków.
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Original NVD description (English source)
A vulnerability in the Internet Key Exchange Version 2 (IKEv2) module of Cisco IOS 15.0 through 15.6 and Cisco IOS XE 3.5 through 16.5 could allow an unauthenticated, remote attacker to cause high CPU utilization, traceback messages, or a reload of an affected device that leads to a denial of service (DoS) condition. The vulnerability is due to how an affected device processes certain IKEv2 packets. An attacker could exploit this vulnerability by sending specific IKEv2 packets to an affected device to be processed. A successful exploit could allow the attacker to cause high CPU utilization, traceback messages, or a reload of the affected device that leads to a DoS condition. This vulnerability affects Cisco devices that have the Internet Security Association and Key Management Protocol (ISAKMP) enabled. Although only IKEv2 packets can be used to trigger this vulnerability, devices that are running Cisco IOS Software or Cisco IOS XE Software are vulnerable when ISAKMP is enabled. A device does not need to be configured with any IKEv2-specific features to be vulnerable. Many features use IKEv2, including different types of VPNs such as the following: LAN-to-LAN VPN; Remote-access VPN, excluding SSL VPN; Dynamic Multipoint VPN (DMVPN); and FlexVPN. Cisco Bug IDs: CSCvc41277.