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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.003 (20.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 20.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
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
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.