CVE-2018-6794Suricata Vulnerability
Suricata before 4.0.4 is prone to an HTTP detection bypass vulnerability in detect.c and stream-tcp.c.
Published Feb 7, 2018 · Updated Aug 4, 2026 · Also known as DEBIAN-CVE-2018-6794, UBUNTU-CVE-2018-6794
Key Facts
Routine patching- CVE-2018-6794 is a medium-severity vulnerability (CVSS 5.3 v3.1) affecting Suricata (Suricata-Ids), Debian Linux.
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 24% probability of exploitation in the next 30 days.
- Fixed versions are available, including Suricata 1:4.0.4-1, Suricata 2.0.7-2+deb8u3, Suricata 4.0.4.
- Brandefense priority: routine patching, as no exploitation is known and its severity is moderate or low.
Scores
CVSS v3.1
5.3
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
EPSS (30-day exploit likelihood)
24%
Higher than 97.7% of all scored CVEs
Exploit maturity
Proof of concept
ATLAS score
39/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Not listed
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Proof of concept
Public exploit code
2
Proof-of-concept links
In-the-wild evidence
0
Reports of active use
Advisories And Exploit References
- advisoryhttps://security-tracker.debian.org/tracker/CVE-2018-6794
- advisoryhttps://ubuntu.com/security/CVE-2018-6794
- advisoryhttps://www.cve.org/CVERecord?id=CVE-2018-6794
- advisory[debian-lts-announce] 20181204 [SECURITY] [DLA 1603-1] suricata security update
- advisoryhttps://redmine.openinfosecfoundation.org/issues/2427
- advisoryhttps://suricata-ids.org/2018/02/14/suricata-4-0-4-available/
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.
Affected Products
13 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| SuricataSuricata-Ids | See advisory | 4.0.4 |
| Debian LinuxDebian | 8.0 | n/a |
Patched Releases
Suricata
1:4.0.4-1, 2.0.7-2+deb8u3, 4.0.4
Timeline
Publicly disclosed
Feb 7, 2018
Last updated
Aug 4, 2026
Weakness Type
- CWE-693 Protection Mechanism Failure
References
- advisorysecurity-tracker.debian.org · CVE-2018-6794
- advisoryubuntu.com · CVE-2018-6794
- advisorycve.org · CVERecord
- advisory[debian-lts-announce] 20181204 [SECURITY] [DLA 1603-1] suricata security update
- advisoryredmine.openinfosecfoundation.org · 2427
FAQ
Common Questions.
Suricata before 4.0.4 is prone to an HTTP detection bypass vulnerability in detect.c and stream-tcp.c.
Affected: Suricata (Suricata-Ids); Debian Linux versions 8.0. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Suricata 1:4.0.4-1, Suricata 2.0.7-2+deb8u3, Suricata 4.0.4.
Brandefense priority: routine patching, as no exploitation is known and its severity is moderate or low.
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