CVE-2025-20225: Cisco Adaptive Security Appliance ASA Software

Medium severity, CVSS 5.8. EPSS: 0.7% chance of exploitation in the next 30 days.

A vulnerability in the Internet Key Exchange Version 2 (IKEv2) feature of Cisco IOS Software, IOS XE Software, Secure Firewall Adaptive Security Appliance (ASA) Software, and 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. This vulnerability is due to a lack of proper processing of IKEv2 packets. An attacker could exploit this vulnerability by sending crafted IKEv2 packets to an affected device. In the case of Cisco IOS and IOS XE Software, a successful exploit could allow the attacker to cause the device to reload unexpectedly. In the case of Cisco ASA and FTD Software, a successful exploit could allow the attacker to partially exhaust system memory, causing system instability such as being unable to establish new IKEv2 VPN sessions. A manual reboot of the device is required to recover from this condition.

Affected products

• Cisco Cisco Adaptive Security Appliance ASA Software: version 9.8.1 only; version 9.8.1.5 only; version 9.8.1.7 only; version 9.8.2 only; version 9.8.2.8 only; version 9.8.2.14 only; …
• Cisco Cisco Firepower Threat Defense Software: version 6.2.3 only; version 6.2.3.1 only; version 6.2.3.2 only; version 6.2.3.3 only; version 6.2.3.4 only; version 6.2.3.5 only; …
• Cisco Cisco IOS XE Software: version 3.3.0SG only; version 3.3.2SG only; version 3.3.1SG only; version 3.4.0SG only; version 3.4.2SG only; version 3.4.1SG only; …
• Cisco IOS: version 15.1(2)T only; version 15.1(1)T4 only; version 15.1(3)T2 only; version 15.1(1)T1 only; version 15.1(2)T0a only; version 15.1(3)T3 only; …

Published 2025-08-14. Last modified 2026-06-17.