CVE-2026-20058Cisco Secure Firewall Threat Defense Software Snort 3 Visual Basic for Application Denial of Service Vulnerability
- 5.8MediumCVSS base score
- 0.45%Exploitation in 30 daysEPSS · top 60% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
Multiple Cisco products are affected by vulnerabilities in the Snort 3 VBA feature that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to crash. These vulnerabilities are due to improper error checking when decompressing VBA data. An attacker could exploit these vulnerabilities by sending crafted VBA data to the Snort 3 Detection Engine on the targeted device. A successful exploit could allow the attacker to cause the Snort 3 Detection Engine to unexpectedly restart, causing a DoS condition.
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)
- 0.45% · top 60% 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: Medium 5.8.
Affected products
Cisco · Cisco Secure Firewall Threat Defense (FTD) Software
- affected 7.2.0
- affected 7.2.0.1
- affected 7.2.1
- affected 7.3.0
- affected 7.2.2
- affected 7.2.3
- affected 7.3.1
- affected 7.2.4
- affected 7.2.5
- affected 7.2.4.1
- affected 7.3.1.1
- affected 7.4.0
- affected 7.2.5.1
- affected 7.4.1
- affected 7.2.6
- affected 7.4.1.1
- affected 7.2.7
- affected 7.2.5.2
- affected 7.3.1.2
- affected 7.2.8
- affected 7.6.0
- affected 7.4.2
- affected 7.2.8.1
- affected 7.4.2.1
- affected 7.2.9
- affected 7.7.0
- affected 7.4.2.2
- affected 7.2.10
- affected 7.6.1
- affected 7.4.2.3
- affected 7.6.2
- affected 7.7.10
- affected 7.6.2.1
- affected 7.7.10.1
- affected 7.4.2.4
- affected 7.2.10.2
- affected 7.4.3
Cisco · Cisco UTD SNORT IPS Engine Software
- affected 17.9.3a
- affected 17.12.1a
- affected 17.12.2
- affected 17.13.1a
- affected 17.9.5a
- affected 17.12.3
- affected 17.14.1a
- affected 17.12.4
- affected 17.12.3a
- affected 17.15.1a
- affected 17.9.6
- affected 17.16.1a
- affected 17.12.4a
- affected 17.15.2c
- affected 17.12.4b
- affected 17.15.2a
- affected 17.12.5
- affected 17.17.1
- affected 17.12.5a
- affected 17.15.3a
- affected 17.15.3
- affected 17.12.5b
- affected 17.12.5c
- affected 17.15.4
- affected 17.18.1
- affected 17.18.1a
- affected 17.12.6
- affected 17.15.4c
- affected 17.12.5d
- affected 17.18.2
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.
References
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-2026-9462 (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-2026-20058)Record last updated .