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A vulnerability in the IKEv2 feature of Cisco Secure Firewall ASA Software and Cisco Secure FTD Software could allow an unauthenticated, remote attacker to cause a DoS condition on an affected device that may impact the availability of services to devices elsewhere in the network.
 This vulnerability is due to a memory leak when parsing IKEv2 packets. An attacker could exploit this vulnerability by sending crafted IKEv2 packets to an affected device. A successful exploit could allow the attacker to exhaust resources, causing a DoS condition that will eventually require the device to be manually reloaded.

CVE-2026-20015 is a vulnerability identified in the IKEv2 feature of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firepower Threat Defense (FTD) Software. The root cause is a memory leak occurring during the parsing of IKEv2 packets. An unauthenticated, remote attacker can exploit this flaw by sending specially crafted IKEv2 packets to the targeted device. This exploitation leads to progressive memory exhaustion, which ultimately causes a denial-of-service (DoS) condition by depleting system resources. The affected software versions span a wide range of releases from 9.18.1 through 9.23.1, covering multiple minor and patch versions, indicating a broad exposure. The vulnerability does not impact confidentiality or integrity directly but severely affects availability, as the device may become unresponsive and require manual reboot to restore normal operation. The attack vector requires no privileges or user interaction, making it easier to exploit remotely over the network. Although no known exploits have been reported in the wild yet, the medium CVSS score of 5.8 reflects the moderate risk posed by this vulnerability. The scope is limited to Cisco ASA and FTD devices running vulnerable versions, which are widely deployed in enterprise and service provider networks for perimeter security and VPN termination.

Detailed information about CVE-2026-20015: Missing Release of Memory after Effective Lifetime in Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) S

CVE-2026-20015: Missing Release of Memory after Effective Lifetime in Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-20015: Missing Release of Memory after Effective Lifetime in Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software

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