How severe is CVE-2026-20009?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Cisco Secure Firewall Adaptive Security Appliance (Asa) Software

CVE-2026-20009

A vulnerability in the implementation of the proprietary SSH stack with SSH key-based authentication in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software could allow an unauthenticated, remote attacker to log in to a Cisco S…

EPSS: 0.000 (14.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

Cisco Secure Firewall Adaptive Security Appliance (Asa) Software — versions 9.17.1, 9.17.1.7, 9.17.1.9

Weakness classification (CWE)

CWE-138

References

cisco-sa-asa-ssh-keybypass-cr5xPUSf

Frequently asked questions

What is CVE-2026-20009?: CVE-2026-20009 is a medium-severity vulnerability in Cisco Secure Firewall Adaptive Security Appliance (Asa) Software, classified under CWE-138. CVSS score: 5.3/10. Published 2026-03-04.
How severe is CVE-2026-20009?: Medium severity. CVSS v3 base score is 5.3 out of 10.