CVE-2018-6794: Debian Linux

Medium severity, CVSS 5.3. EPSS: 23.7% chance of exploitation in the next 30 days.

Suricata before 4.0.4 is prone to an HTTP detection bypass vulnerability in detect.c and stream-tcp.c. If a malicious server breaks a normal TCP flow and sends data before the 3-way handshake is complete, then the data sent by the malicious server will be accepted by web clients such as a web browser or Linux CLI utilities, but ignored by Suricata IDS signatures. This mostly affects IDS signatures for the HTTP protocol and TCP stream content; signatures for TCP packets will inspect such network traffic as usual.

Affected products

• Debian Debian Linux: version 8.0 only
• Suricata-Ids Suricata: before 4.0.4 (fixed in 4.0.4)

Published 2018-02-07. Last modified 2026-06-17.