CVE-2026-20012
HighCVSS 8.6Exploitation Probability (EPSS)
Low risk29th percentile - higher than 29% of all known CVEs
Summary
A vulnerability in the IKEv2 feature of Cisco IOS, IOS XE, Cisco Secure Firewall ASA, and FTD software allows an unauthenticated remote attacker to trigger a memory leak and denial of service. An attacker sends crafted IKEv2 packets, which can cause device reload or partial memory exhaustion.
Risk Assessment
This can cause VPN service unavailability and system instability, requiring a manual device reboot to recover.
Recommendation
Apply the patches provided by Cisco for the relevant IOS, IOS XE, ASA, and FTD software versions.
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Original NVD description (English source)
A vulnerability in the Internet Key Exchange version 2 (IKEv2) feature of Cisco IOS Software, Cisco IOS XE Software, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software, and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to trigger a memory leak, resulting in a denial of service (DoS) condition on an affected device. This vulnerability is due to improper parsing of IKEv2 packets. An attacker could exploit this vulnerability by sending crafted IKEv2 packets to an affected device. A successful exploit of Cisco IOS Software and IOS XE Software could allow the attacker to cause the affected device to reload, resulting in a DoS condition. A successful exploit of Cisco Secure Firewall ASA Software and Secure FTD Software could allow the attacker to partially exhaust system memory, resulting in system instability, such as the inability to establish new IKEv2 VPN sessions. A manual reboot of the device is required to recover from this condition.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

