SAML 2.0 Single Sign-On Vulnerability in Cisco Secure Firewall ASA and Secure FTD
CVE-2026-20101

8.6HIGH

Key Information:

Vendor

Cisco
Status
Cisco Secure Firewall Adaptive Security Appliance (asa) Software
Cisco Secure Firewall Threat Defense (ftd) Software
Vendor
CVE Published:
4 March 2026

Badges

👾 Exploit Exists

What is CVE-2026-20101?

The vulnerability in the SAML 2.0 single sign-on feature of Cisco Secure Firewall ASA and Secure FTD Software arises from inadequate error handling when processing SAML messages. This flaw could be exploited by unauthenticated remote attackers who send specially crafted SAML messages to the service. Successful exploitation may trigger a device reload, leading to an unexpected Denial of Service (DoS), impeding access to the systems reliant on these firewalls.

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Deploy the Patch

Affected Version(s)

Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.1

Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.1.2

Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.1.3

References

https://sec.cloudapps.cisco.com/security/center/content/C...

CVSS V3.1

Score:
8.6
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Changed

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

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