Description
A vulnerability in the implementation of Security Assertion Markup Language (SAML) 2.0 Single Sign-On (SSO) for Clientless SSL VPN (WebVPN) and AnyConnect Remote Access VPN in Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to successfully establish a VPN session to an affected device. The vulnerability is due to improper credential management when using NT LAN Manager (NTLM) or basic authentication. An attacker could exploit this vulnerability by opening a VPN session to an affected device after another VPN user has successfully authenticated to the affected device via SAML SSO. A successful exploit could allow the attacker to connect to secured networks behind the affected device.
Affected products
cisco: secure firewall threat defense; cisco: adaptive security appliance software; cisco: adaptive security virtual appliance; cisco: asa-5506-x; cisco: asa-5506h-x; cisco: asa-5506w-x; cisco: asa-5508-x; cisco: asa-5516-x; cisco: asa-5525-x; cisco: asa-5545-x; cisco: asa-5555-x; cisco: firepower 2110; cisco: firepower 2120; cisco: firepower 2130; cisco: firepower 2140
References4
- tools.cisco.com/security/center/content/CiscoSecurityAdvisory/c… Vendor Advisory
- tools.cisco.com/security/center/content/CiscoSecurityAdvisory/c… Vendor Advisory
- www.securityfocus.com/bid/108185 Third Party AdvisoryVDB Entry
- www.securityfocus.com/bid/108185 Third Party AdvisoryVDB Entry
Metrics
- CVSS 3.1
-
8.6
HIGH
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N - EPSS — exploit probability
- 2% percentile: 81 · as of 10 November 2026
- CWE
- CWE-255
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