Monitor vulnerabilities like this one.
Sign up free to get alerted when software you use is affected.
5.8
Cisco Products: Unauthenticated Restart of Snort 3 Detection Engine
CVE-2026-20067
Summary
Some Cisco products that use the Snort 3 detection engine are at risk of being shut down by a hacker who can send a specific type of malicious internet traffic. This could cause a denial of service, interrupting the monitoring of network traffic. Cisco has likely already fixed this issue in newer versions of their software, so it's essential to check for and install any available updates.
Original title
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, result...
Original description
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. 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.
This vulnerability is due to incomplete error checking when parsing the Multicast DNS fields of the HTTP header. 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.
nvd CVSS3.1
5.8
Vulnerability type
CWE-787
Out-of-bounds Write
Published: 4 Mar 2026 · Updated: 13 Mar 2026 · First seen: 6 Mar 2026