CVE-2018-6794 Security feature bypass in n/a

What is CVE-2018-6794?

CVE-2018-6794 is a medium-severity vulnerability in Debian Debian Linux, published on 7 Feb 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-693

Which versions are affected by CVE-2018-6794?

It affects 2 products.

Products include Debian Debian Linux, Suricata-Ids Suricata.

How do I fix CVE-2018-6794?

Upgrade to a fixed version.

Is CVE-2018-6794 being exploited?

There is no known exploitation of CVE-2018-6794 in the wild and no public exploit code.

Public exploit code: 1 Exploit-DB entry.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2018-6794, GHSA-wfvj-pf5x-3547, UBUNTU-CVE-2018-6794.