Vulnerability in Cisco Adaptive Security Appliance Software
CVE-2026-20013
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 also impact the availability of services to devices elsewhere in the network. This vulnerability is due to memory exhaustion caused by not freeing memory during IKEv2 packet processing. 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 manually reload.
EPSS: 0.003 (22.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L.
Affected products
- Cisco Adaptive_security_appliance_software
- Cisco Secure Firewall Adaptive Security Appliance (Asa) Software — versions 9.12.1, 9.12.1.2, 9.12.1.3
- Cisco Secure Firewall Threat Defense (Ftd) Software — versions 6.4.0, 6.4.0.1, 6.4.0.3
- Cisco Firepower_threat_defense_software
- Cisco Secure_firewall_threat_defense
Weakness classification (CWE)
References
- psirt@cisco.com (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-20013?
- CVE-2026-20013 is a medium-severity vulnerability in Cisco Adaptive Security Appliance Software, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 5.8/10. Published 2026-03-04.
- How severe is CVE-2026-20013?
- Medium severity. CVSS v3 base score is 5.8 out of 10.