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Public proof of conceptFix available

CVE-2018-6794

A public proof of concept exists; no exploitation attested.

  • Published2018-02-07
  • WeaknessCWE-693

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2018-02-0705:29CVE publishedNVD
  2. 2018-03-05Exploit-DB entryExploit-DB
  3. 2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Versions per branch

NVD
Debian debian linux
BranchAffectedFixed in
8.0= 8.0no fix published
Suricata-ids suricata
BranchAffectedFixed in
4.0< 4.0.44.0.4

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • suricataUbuntu:18.04:LTSall versions · no fixed version listed
  • suricataUbuntu:16.04:LTSall versions · no fixed version listed
  • suricataDebian:14all versions · fixed in 1:4.0.4-1
  • suricataDebian:13all versions · fixed in 1:4.0.4-1
  • suricataDebian:8all versions · fixed in 2.0.7-2+deb8u3

Full record on NVD

Fix

Advisories and patches

Detection

read 2026-11-09 09:28 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
EDB-44247
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Published
2018-02-07
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-wfvj-pf5x-3547

Frequently asked questions

What is CVE-2018-6794?

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.

Is CVE-2018-6794 actively exploited?

Active exploitation of CVE-2018-6794 has not been confirmed. Its EPSS score was 23.7% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-6794?

CVE-2018-6794 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

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Sources for this record