What is CVE-2026-20101?

CVE-2026-20101 is a high-severity vulnerability in Cisco Secure Firewall Adaptive Security Appliance (Asa) Software, classified under Use of Insufficiently Random Values. CVSS score: 8.6/10. Published 2026-03-04.

How severe is CVE-2026-20101?

High severity. CVSS v3 base score is 8.6 out of 10.

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

CVE-2026-20101

A vulnerability in the SAML 2.0 single sign-on (SSO) feature of Cisco Secure Firewall ASA Software and Secure FTD Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a DoS condi…

EPSS: 0.002 (36.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.

Affected products

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

Weakness classification (CWE)

CWE-330 — Use of Insufficiently Random Values

References

cisco-sa-asaftd-vpn-m9sx6MbC

Frequently asked questions

What is CVE-2026-20101?: CVE-2026-20101 is a high-severity vulnerability in Cisco Secure Firewall Adaptive Security Appliance (Asa) Software, classified under Use of Insufficiently Random Values. CVSS score: 8.6/10. Published 2026-03-04.
How severe is CVE-2026-20101?: High severity. CVSS v3 base score is 8.6 out of 10.