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CVE-2026-20101

HIGH CVSS 3.1: 8.6 EPSS 0.15%
Updated Apr 16, 2026
Cisco
Parameter Value
CVSS 8.6 (HIGH)
Affected Versions 6.4.0 — 9.23.1.7
Fixed In 9.16.4.85
Type CWE-330
Vendor Cisco
Public PoC No

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 condition. This vulnerability is due to insufficient error checking when processing SAML messages. An attacker could exploit this vulnerability by sending crafted SAML messages to the SAML service.

A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service

CVSS Vector v3.1

Weakness Type (CWE)

Vulnerable Products 10

Configuration From (including) Up to (excluding)
Cisco Adaptive_Security_Appliance_Software
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
9.12.1 9.16.4.85
Cisco Adaptive_Security_Appliance_Software
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
9.17.1 9.18.4.66
Cisco Adaptive_Security_Appliance_Software
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
9.19.1 9.20.4
Cisco Adaptive_Security_Appliance_Software
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
9.22.1.1 9.22.2.4
Cisco Adaptive_Security_Appliance_Software
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
9.23.1 9.23.1.7
Cisco Firepower_Threat_Defense_Software
cpe:2.3:a:cisco:firepower_threat_defense_software:*:*:*:*:*:*:*:*
6.4.0 7.0.9
Cisco Firepower_Threat_Defense_Software
cpe:2.3:a:cisco:firepower_threat_defense_software:*:*:*:*:*:*:*:*
7.1.0 7.2.11
Cisco Firepower_Threat_Defense_Software
cpe:2.3:a:cisco:firepower_threat_defense_software:*:*:*:*:*:*:*:*
7.3.0 7.4.3
Cisco Firepower_Threat_Defense_Software
cpe:2.3:a:cisco:firepower_threat_defense_software:*:*:*:*:*:*:*:*
7.6.0 7.6.4
Cisco Firepower_Threat_Defense_Software
cpe:2.3:a:cisco:firepower_threat_defense_software:*:*:*:*:*:*:*:*
7.7.0 7.7.11