CVE-2024-20331
A vulnerability in the session authentication functionality of the Remote Access SSL VPN feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to prevent users from authenticating. This vulnerability is due to insufficient entropy in the authentication process. An attacker could exploit this vulnerability by determining the handle of an authenticating user and using it to terminate their authentication session. A successful exploit could allow the attacker to force a user to restart the authentication process, preventing a legitimate user from establishing remote access VPN sessions.
Key facts
- CVSS score
- 6.8 (v3.1)
- Severity
- MEDIUM
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H- Weakness (CWE)
- CWE-330
- EPSS score
- 0.7% (51th percentile)
- In CISA KEV
- No
- In EU EUVD
- Yes (EUVD-2024-18046)
- Published
- October 23, 2024
- NVD last modified
- August 11, 2026
- Status
- Analyzed
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2024-18046 in the EU Vulnerability Database. Last updated in EUVD on October 24, 2024.
View on the EU Vulnerability DatabaseAffected products
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
and 222 more…
Certified products that may be affected
2 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.
- Cisco Secure Firewall Threat Defense (FTD) 7.4 with Secure Firewall Management Center (FMC) 7.4 and Secure Client 5.1 - Cisco Systems, Inc. - Common Criteria NSCIB-CC-2400046-01-CR - active
- Cisco Secure Firewall Threat Defense Virtual 7.4 with FMC/FMCv - Cisco Systems, Inc. - Common Criteria CCEVS-VR-VID-11510-2025 - active
References
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-vpn-nyH3fhp(Vendor Advisory)
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-xss-M446vbEO(Broken Link)
- https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-75300(Vendor Advisory)
Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
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