CVE-2026-20053 is a denial-of-service vulnerability affecting multiple Cisco products utilizing the Snort 3 VBA feature. This flaw stems from improper range checking during VBA data decompression, allowing an unauthenticated, remote attacker to crash the Snort 3 Detection Engine by sending crafted VBA data. With a CVSS score of 5.8 (Medium), the vulnerability is easily exploitable over the network with low attack complexity, potentially leading to a denial-of-service condition. There is currently no evidence of active exploitation, nor are public exploit codes like Metasploit or Nuclei available. Despite limited community discussion, the vulnerability has garnered some media attention.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
| Cisco | Cisco Cyber Vision | 3.0.0, 3.0.1, 3.0.2, 3.0.3, 3.0.4, 3.0.5, 3.0.6, 3.1.0, 3.1.1, 3.1.2, 3.2.0, 3.2.1, 3.2.2, 3.2.3, 3.2.4, 4.0.0, 4.0.1, 4.0.2, 4.0.3, 4.1.0, 4.1.1, 4.1.2, 4.1.3, 4.1.4, 4.1.5, 4.1.6, 4.1.7, 4.2.0, 4.2.1, 4.2.2, 4.2.3, 4.2.4, 4.2.6, 4.2.X, 4.3.0, 4.3.1, 4.3.2, 4.3.3, 4.4.0, 4.4.1, 4.4.2, 4.4.3, 5.0.0, 5.0.1, 5.0.2, 5.1.0, 5.1.1, 5.1.2, 5.1.3, 5.2.0, 5.2.1, 5.3.0, 5.3.1, 5.3.2CNA affecteddefault unknown | |
| Cisco | Cisco Secure Firewall Threat Defense (FTD) Software | 7.2.0, 7.2.0.1, 7.2.1, 7.2.10, 7.2.10.2, 7.2.2, 7.2.3, 7.2.4, 7.2.4.1, 7.2.5, 7.2.5.1, 7.2.5.2, 7.2.6, 7.2.7, 7.2.8, 7.2.8.1, 7.2.9, 7.3.0, 7.3.1, 7.3.1.1, 7.3.1.2, 7.4.0, 7.4.1, 7.4.1.1, 7.4.2, 7.4.2.1, 7.4.2.2, 7.4.2.3, 7.4.2.4, 7.4.3, 7.6.0, 7.6.1, 7.6.2, 7.6.2.1, 7.7.0, 7.7.10, 7.7.10.1CNA affecteddefault unknown | |
| Cisco | Cisco UTD SNORT IPS Engine Software | 17.12.1a, 17.12.2, 17.12.3, 17.12.3a, 17.12.4, 17.12.4a, 17.12.4b, 17.12.5, 17.12.5a, 17.12.5b, 17.12.5c, 17.12.5d, 17.12.6, 17.13.1a, 17.14.1a, 17.15.1a, 17.15.2a, 17.15.2c, 17.15.3, 17.15.3a, 17.15.4, 17.15.4c, 17.16.1a, 17.17.1, 17.18.1, 17.18.1a, 17.18.2, 17.9.4, 17.9.5eCNA affecteddefault unknown |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.
The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.