Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Snort | >= 3.0.0-233, < 3.9.3.0 |
| Cisco | Cyber Vision | 3.0.0 |
| Cisco | Secure Firewall Threat Defense | 7.2.0 |
| Cisco | Unified Threat Defense Snort Intrusion Prevention System Engine | 3.17.0s |
Related Weaknesses (CWE)
References
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/ciVendor AdvisoryMitigation
FAQ
What is CVE-2026-20054?
CVE-2026-20054 is a vulnerability with a CVSS score of 5.8 (MEDIUM). 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 vu...
How severe is CVE-2026-20054?
CVE-2026-20054 has been rated MEDIUM with a CVSS base score of 5.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-20054?
Check the references section above for vendor advisories and patch information. Affected products include: Cisco Snort, Cisco Cyber Vision, Cisco Secure Firewall Threat Defense, Cisco Unified Threat Defense Snort Intrusion Prevention System Engine.