Cisco Adaptive Security Appliance (ASA) is a security device that combines firewall, antivirus, intrusion prevention, and virtual private network (VPN) capabilities. It provides proactive threat defense that stops attacks before they spread through the network.

Cisco Adaptive Security Appliance (ASA)

Cisco Firepower Threat Defense (FTD) is a unified software solution that integrates comprehensive network security features, including firewall capabilities, application control, intrusion prevention, and malware protection.

Cisco Firepower Threat Defense (FTD)

A vulnerability in the Internet Key Exchange Version 2 (IKEv2) module of Cisco 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 improper parsing of IKEv2 packets. An attacker could exploit this vulnerability by sending a continuous stream of crafted IKEv2 packets to an affected device. A successful exploit could allow the attacker to partially exhaust system memory, causing system instability like being unable to establish new IKEv2 VPN sessions. A manual reboot of the device is required to recover from this condition.

CVE-2025-20252:
Cisco Adaptive Security Appliance (ASA) vulnerability analysis and mitigation

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Technical details

Impact

Mitigation and workarounds

Additional resources

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CVE-2025-20252: Cisco Adaptive Security Appliance (ASA) vulnerability analysis and mitigation