Vulnerability in Cisco Adaptive Security Appliance Software
CVE-2026-20015
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.
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 9.18.1, 9.18.1.3, 9.18.2
- Cisco Secure Firewall Threat Defense (Ftd) Software — versions 7.2.0, 7.2.0.1, 7.2.1
- 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-2026-20015?
- CVE-2026-20015 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-2026-20015?
- Medium severity. CVSS v3 base score is 5.8 out of 10.