CVE-2026-20005
Multiple Cisco products are affected by a vulnerability in the Snort 3 Detection Engine that could allow an unauthenticated, remote…
- 5.8MediumCVSS base score
- 0.56%Exploitation in 30 daysEPSS · top 53% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
Multiple Cisco products are affected by a vulnerability in the Snort 3 Detection Engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection. This vulnerability is due to incomplete parsing of the SSL handshake ingress packets. An attacker could exploit this vulnerability by sending crafted SSL handshake packets. A successful exploit could allow the attacker to cause a denial of service (DoS) condition when the Snort 3 Detection Engine restarts unexpectedly.
Timeline
ID reserved
By cisco
- 5 months later
· 5 months later
Published
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 | Medium5.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L |
| NVDNVD · Analyzed | 3.1 | Medium5.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L |
- EPSS (exploitation in 30 days)
- 0.56% · top 53% of all CVEs (10 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: Medium 5.8.
Affected products
Cisco · Cisco Secure Firewall Threat Defense (FTD) Software
- affected 7.6.0
- affected 7.6.1
- affected 7.6.2
- affected 7.6.2.1
- affected 7.7.0
- affected 7.7.10
- affected 7.7.10.1
- affected 3.0.4
- affected 3.0.0
- affected 3.0.1
- affected 3.0.2
- affected 3.0.3
- affected 3.0.5
- affected 3.0.6
- affected 3.1.0
- affected 3.1.2
- affected 3.1.1
- affected 3.2.3
- affected 3.2.1
- affected 3.2.4
- affected 3.2.0
- affected 3.2.2
- affected 4.0.0
- affected 4.0.1
- affected 4.0.2
- affected 4.0.3
- affected 4.1.0
- affected 4.1.1
- affected 4.1.2
- affected 4.1.3
- affected 4.1.4
- affected 4.1.5
- affected 4.1.6
- affected 4.1.7
- affected 4.2.0
- affected 4.2.1
- affected 4.2.4
- affected 4.2.6
- affected 4.2.2
- affected 4.2.3
- affected 4.3.0
- affected 4.3.1
- affected 4.3.2
- affected 4.3.3
- affected 4.4.0
- affected 4.4.1
- affected 4.4.2
- and 12 more
Cisco · Cisco UTD SNORT IPS Engine Software
- affected 17.2.1r
- affected 17.3.1a
- affected 17.3.2
- affected 17.3.3
- affected 17.3.4a
- affected 17.3.6
- affected 17.3.5
- affected 17.3.7
- affected 17.3.8
- affected 17.4.1a
- affected 17.4.2
- affected 17.4.1b
- affected 17.5.1a
- affected 17.6.1a
- affected 17.6.2
- affected 17.6.3a
- affected 17.6.4
- affected 17.6.5
- affected 17.6.6
- affected 17.6.7
- affected 17.6.8a
- affected 17.7.1a
- affected 17.7.2
- affected 17.10.1a
- affected 17.9.1a
- affected 17.9.2a
- affected 17.9.3a
- affected 17.9.4
- affected 17.9.5a
- affected 17.9.6
- affected 17.9.5e
- affected 17.9.5f
- affected 17.9.7a
- affected 17.9.8
- affected 17.9.7b
- affected 17.8.1a
- affected 17.11.1a
- affected 17.12.1a
- affected 17.12.2
- affected 17.12.3
- and 22 more
What to do
Exploitation: The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.
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-2026-9427 (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-2026-20005)Record last updated .