Vulnerability in Cisco Secure Firewall Adaptive Security Appliance (Asa) Software
CVE-2026-20222
A vulnerability in the EIGRP implementation in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, adjacent attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to improper resource management when handling EIGRP update messages. An attacker could exploit this vulnerability by sending crafted EIGRP updates at a high rate to an affected device. A successful exploit could allow the attacker to trigger a memory leak that will eventually cause the affected device to reload unexpectedly.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.003 (17.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 17th percentile — 17.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
- Cisco Secure Firewall Adaptive Security Appliance (Asa) Software — versions 9.19.1, 9.19.1.12, 9.19.1.18
- Cisco Secure Firewall Threat Defense (Ftd) Software — versions 10.0.0, 7.3.0, 7.3.1
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-20222?
- CVE-2026-20222 is a high-severity vulnerability in Cisco Secure Firewall Adaptive Security Appliance (Asa) Software, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 7.4/10. Published 2026-09-16.
- How severe is CVE-2026-20222?
- High severity. CVSS v3 base score is 7.4 out of 10.