Product:
Snort 3
Summary
Multiple Cisco products are affected by a vulnerability in the Snort 3 detection engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection. This vulnerability is due to incomplete error checking when parsing the Multicast DNS fields of the HTTP header. A successful exploit could allow the attacker to cause a DoS condition when the Snort 3 Detection Engine unexpectedly restarts.
Details
| Severity | Base Score | CVE |
|---|---|---|
| MEDIUM | 5.8 | CVE-2026-20067 |
Exploitation
An attacker could exploit this vulnerability by sending crafted HTTP packets through an established connection to be parsed by Snort 3. By manipulating the Multicast DNS fields in the HTTP header, the attacker can trigger the vulnerability, leading to a denial of service condition as the Snort 3 Detection Engine restarts unexpectedly.
Affected Products
- Snort 3 Detection Engine: Vulnerable to DoS attacks due to improper error handling in HTTP header parsing.
Mitigation
To mitigate this vulnerability, users should ensure they are using the latest version of the Snort 3 detection engine and apply any available patches. Regular monitoring of network traffic and implementing additional security measures can also help reduce the risk of exploitation.