CVE-2024-20339Cisco Firepower Threat Defense Software for Firepower 2100 Series TLS Denial of Service Vulnerability
- 8.6HighCVSS base score
- 0.71%Exploitation in 30 daysEPSS · top 46% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
A vulnerability in the TLS processing feature of Cisco Firepower Threat Defense (FTD) Software for Cisco Firepower 2100 Series could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to an issue that occurs when TLS traffic is processed. An attacker could exploit this vulnerability by sending certain TLS traffic over IPv4 through an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition and impacting traffic to and through the affected device.
Timeline
ID reserved
By cisco
- 12 months later
· 12 months later
Published
- 1 day later
· 1 day later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| ciscoCNA (assigner) | 3.1 | High8.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H |
| NVDNVD · Analyzed | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.71% · top 46% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.6.
Affected products
Cisco · Cisco Firepower Threat Defense Software
- affected 6.2.3
- affected 6.2.3.9
- affected 6.2.3.1
- affected 6.2.3.2
- affected 6.2.3.10
- affected 6.4.0
- affected 6.4.0.3
- affected 6.4.0.4
- affected 6.2.3.15
- affected 6.2.3.6
- affected 6.2.3.7
- affected 6.2.3.12
- affected 6.2.3.3
- affected 6.2.3.11
- affected 6.4.0.6
- affected 6.2.3.13
- affected 6.2.3.8
- affected 6.2.3.4
- affected 6.4.0.1
- affected 6.2.3.5
- affected 6.4.0.5
- affected 6.2.3.14
- affected 6.4.0.2
- affected 6.4.0.8
- affected 6.4.0.7
- 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 40 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
References3
- cisco-sa-ftd-tls-dos-QXYE5Ufy (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)
- EUVD EUVD-2024-18054 (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://cveledger.app/cve/CVE-2024-20339)Record last updated .