CVE-2025-20360
Multiple Cisco Products Snort 3 MIME Denial of Service Vulnerability
Description
Multiple Cisco products are affected by a vulnerability in the Snort 3 HTTP Decoder that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart. This vulnerability is due to a lack of complete error checking when the MIME fields of the HTTP header are parsed. An attacker could exploit this vulnerability by sending crafted HTTP packets through an established connection to be parsed by Snort 3. A successful exploit could allow the attacker to cause a DoS condition when the Snort 3 Detection Engine unexpectedly restarts.
Weakness: CWE-805
Affected products
| Vendor | Product | Category | Matched by |
|---|---|---|---|
| Cisco | Cisco Cyber Vision | OT / IoT Security | cna-assigner |
| Cisco | Cisco Firepower Threat Defense (FTD) Check your version | Firewall / NGFW | cna-assigner |
Vendor-reported products (2)
- Cisco · Cisco Cyber Vision
- Cisco · Cisco Secure Firewall Threat Defense (FTD) Software
Vendor advisory
cisco-sa-snort3-mime-vulns-tTL8PgVH
Multiple Cisco Products Snort 3 MIME Denial of Service Vulnerabilities
Cisco’s rating: Medium (advisory CVSS 6.5) · Published Oct 15, 2025 · updated Feb 12, 2026 (revision 1.1)
Bug IDs: CSCwo71401 , CSCwq03467 , CSCwq15864 , CSCwq42141 , CSCwq42153 , CSCwq42161
The vendor’s rating applies to the whole advisory and can differ from this CVE’s own CVSS severity. Where this comes from