Vulnerability · Published Mar 4, 2026 · Assigned by cisco
CVE-2026-20054Cisco Secure Firewall Threat Defense Software Snort 3 Visual Basic for Application Infinite Loop Denial of Service Vulnerability
Medium 5.8
In plain English
A medium-severity infinite loop in Cisco Cyber Vision from Cisco. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 42% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Cisco Cyber Vision | 3.0.03.0.23.0.33.0.13.1.03.0.43.1.13.1.2 |
| Cisco | Cisco Secure Firewall Threat Defense (FTD) Software | 7.2.07.2.0.17.2.17.3.07.2.27.2.37.3.17.2.4 |
| Cisco | Cisco UTD SNORT IPS Engine Software | 3.17.1S16.12.3Fuji-16.9.516.12.417.3.1a16.6.616.12.2Fuji-16.9.6 |
Weakness: CWE-835 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L