CVE-2024-20331
Cisco Adaptive Security Appliance and Firepower Threat Defense Software VPN Authentication DoS Vulnerability
- Published
- Updated
- Reserved
- Assigned by
- cisco
Description
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| ciscoCNA (assigner) | 3.1 | Medium6.8 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H |
| NVDNVD · Analyzed | 3.1 | Medium5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.68% · top 48% of all CVEs (5 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.8.
Weakness
Affected products
Cisco · Cisco Adaptive Security Appliance (ASA) Software
- affected 9.12.3
- affected 9.8.3
- affected 9.12.1
- affected 9.8.1
- affected 9.12.2
- affected 9.8.2.45
- affected 9.8.2
- affected 9.8.4
- affected 9.14.1
- affected 9.12.4
- affected 9.8.2.26
- affected 9.8.2.24
- affected 9.8.2.15
- affected 9.8.2.14
- affected 9.8.2.35
- affected 9.8.2.20
- affected 9.8.2.8
- affected 9.8.2.17
- affected 9.8.2.28
- affected 9.8.2.33
- affected 9.8.2.38
- affected 9.8.4.25
- affected 9.12.3.2
- affected 9.12.3.7
- affected 9.8.3.18
- affected 9.8.3.14
- affected 9.8.4.15
- affected 9.8.4.8
- affected 9.8.1.7
- affected 9.8.3.29
- affected 9.14.1.10
- affected 9.12.2.5
- affected 9.8.4.22
- affected 9.12.3.12
- affected 9.8.4.7
- affected 9.8.4.17
- affected 9.8.3.16
- affected 9.8.4.20
- affected 9.8.3.11
- affected 9.12.1.3
- and 148 more
Cisco · Cisco Firepower Threat Defense Software
- affected 6.2.3.14
- affected 6.4.0.1
- affected 6.2.3.7
- affected 6.2.3
- affected 6.4.0.2
- affected 6.2.3.9
- affected 6.2.3.1
- affected 6.2.3.2
- affected 6.4.0.5
- affected 6.2.3.10
- affected 6.4.0
- affected 6.4.0.3
- affected 6.2.3.6
- affected 6.4.0.4
- affected 6.2.3.15
- affected 6.2.3.5
- affected 6.2.3.4
- affected 6.2.3.3
- affected 6.2.3.8
- affected 6.4.0.6
- affected 6.2.3.11
- affected 6.2.3.12
- affected 6.2.3.13
- affected 6.4.0.7
- affected 6.4.0.8
- affected 6.6.0
- affected 6.4.0.9
- affected 6.2.3.16
- affected 6.6.0.1
- affected 6.6.1
- affected 6.4.0.10
- affected 6.7.0
- affected 6.4.0.11
- affected 6.6.3
- affected 6.7.0.1
- affected 6.6.4
- affected 6.4.0.12
- affected 6.7.0.2
- affected 7.0.0
- affected 6.2.3.17
- and 44 more
What to do
Exploitation: The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
References (3)
- cisco-sa-asa-vpn-nyH3fhp (opens in a new tab)
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-xss-M446vbEO (opens in a new tab)
- Cisco Event Response: October 2024 Semiannual Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2024-20331)Record last updated .