CVE-2026-20054
Cisco Secure Firewall Threat Defense Software Snort 3 Visual Basic for Application Infinite Loop Denial of Service Vulnerability
MEDIUM 5.8
At a glance
- Source
- NVD
- EPSS
- EPSS 0.46 % · percentile 40 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- cisco
- NVD status
- Analyzed
Description
Multiple Cisco products are affected by a vulnerability in the Snort 3 VBA feature that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to crash. This vulnerability is due to improper error checking when decompressing VBA data. An attacker could exploit this vulnerability 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 enter an infinite loop, causing a DoS condition.
Weaknesses (CWE)
- CWE-835 — Loop with Unreachable Exit Condition (Infinite Loop)
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | MEDIUM 5.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L | cisco |
| CVSS 3.1 | MEDIUM 5.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L | NVD · psirt@cisco.com (Secondary) |
European references
- ENISA EUVD · EUVD-2026-9460
- GCVE · GCVE-0-2026-20054
Affected configurations (NVD CPE)
cpe:2.3:a:cisco:snort:*:*:*:*:*:*:*:*≥ 3.0.0-233 < 3.9.3.0cpe:2.3:a:cisco:cyber_vision:3.0.0:*:*:*:*:*:*:*cpe:2.3:a:cisco:cyber_vision:3.0.1:*:*:*:*:*:*:*cpe:2.3:a:cisco:cyber_vision:3.0.2:*:*:*:*:*:*:*cpe:2.3:a:cisco:cyber_vision:3.0.3:*:*:*:*:*:*:*cpe:2.3:a:cisco:cyber_vision:3.0.4:*:*:*:*:*:*:*cpe:2.3:a:cisco:cyber_vision:3.0.5:*:*:*:*:*:*:*cpe:2.3:a:cisco:cyber_vision:3.0.6:*:*:*:*:*:*:*cpe:2.3:a:cisco:cyber_vision:3.1.0:*:*:*:*:*:*:*cpe:2.3:a:cisco:cyber_vision:3.1.1:*:*:*:*:*:*:*cpe:2.3:a:cisco:cyber_vision:3.1.2:*:*:*:*:*:*:*cpe:2.3:a:cisco:cyber_vision:3.2.0:*:*:*:*:*:*:*cpe:2.3:a:cisco:cyber_vision:3.2.1:*:*:*:*:*:*:*cpe:2.3:a:cisco:cyber_vision:3.2.2:*:*:*:*:*:*:*cpe:2.3:a:cisco:cyber_vision:3.2.3:*:*:*:*:*:*:*cpe:2.3:a:cisco:cyber_vision:3.2.4:*:*:*:*:*:*:*cpe:2.3:a:cisco:cyber_vision:4.0.0:*:*:*:*:*:*:*cpe:2.3:a:cisco:cyber_vision:4.0.1:*:*:*:*:*:*:*cpe:2.3:a:cisco:cyber_vision:4.0.2:*:*:*:*:*:*:*cpe:2.3:a:cisco:cyber_vision:4.0.3:*:*:*:*:*:*:*cpe:2.3:a:cisco:cyber_vision:4.1.0:*:*:*:*:*:*:*cpe:2.3:a:cisco:cyber_vision:4.1.1:*:*:*:*:*:*:*cpe:2.3:a:cisco:cyber_vision:4.1.2:*:*:*:*:*:*:*cpe:2.3:a:cisco:cyber_vision:4.1.3:*:*:*:*:*:*:*cpe:2.3:a:cisco:cyber_vision:4.1.4:*:*:*:*:*:*:*cpe:2.3:a:cisco:cyber_vision:4.1.5:*:*:*:*:*:*:*cpe:2.3:a:cisco:cyber_vision:4.1.6:*:*:*:*:*:*:*cpe:2.3:a:cisco:cyber_vision:4.1.7:*:*:*:*:*:*:*cpe:2.3:a:cisco:cyber_vision:4.2.0:*:*:*:*:*:*:*cpe:2.3:a:cisco:cyber_vision:4.2.1:*:*:*:*:*:*:*cpe:2.3:a:cisco:cyber_vision:4.2.2:*:*:*:*:*:*:*cpe:2.3:a:cisco:cyber_vision:4.2.3:*:*:*:*:*:*:*cpe:2.3:a:cisco:cyber_vision:4.2.4:*:*:*:*:*:*:*cpe:2.3:a:cisco:cyber_vision:4.2.6:*:*:*:*:*:*:*cpe:2.3:a:cisco:cyber_vision:4.3.0:*:*:*:*:*:*:*cpe:2.3:a:cisco:cyber_vision:4.3.1:*:*:*:*:*:*:*cpe:2.3:a:cisco:cyber_vision:4.3.2:*:*:*:*:*:*:*cpe:2.3:a:cisco:cyber_vision:4.3.3:*:*:*:*:*:*:*cpe:2.3:a:cisco:cyber_vision:4.4.0:*:*:*:*:*:*:*cpe:2.3:a:cisco:cyber_vision:4.4.1:*:*:*:*:*:*:*- +154 more
Affected products
| Product | Versions |
|---|---|
| Cisco · Cisco Cyber Vision | affected 3.0.0 ; affected 3.0.2 ; affected 3.0.3 ; affected 3.0.1 ; affected 3.1.0 ; affected 3.0.4 |
| 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 |
| Cisco · Cisco UTD SNORT IPS Engine Software | affected 3.17.1S ; affected 16.12.3 ; affected Fuji-16.9.5 ; affected 16.12.4 ; affected 17.3.1a ; affected 16.6.6 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |