What is CVE-2018-6794?

CVE-2018-6794 is a medium-severity vulnerability in Suricata-Ids Suricata, classified under Protection Mechanism Failure. CVSS score: 5.3/10. Published 2018-02-07.

How severe is CVE-2018-6794?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Is CVE-2018-6794 known to be exploited?

5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Suricata-Ids Suricata

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.

Published 2018-02-07 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.243 (97.8th percentile), scored 2026-09-29.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 97.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.243 · newest: 0.243 · change: 0.000

Affected products

Suricata-Ids Suricata
Debian Linux — versions 8.0

Weakness classification (CWE)

CWE-693 — Protection Mechanism Failure

Public proof-of-concept exploits

References

github.com/OISF/suricata/pull/3202/commits/e1ef57c848bbe4e567d5d4b66d346a742e3f… (Patch, Third Party Advisory)
lists.debian.org/debian-lts-announce/2018/12/msg00000.html (mailing-list, Mailing List, Third Party Advisory)
redmine.openinfosecfoundation.org/issues/2427 (Third Party Advisory)
suricata-ids.org/2018/02/14/suricata-4-0-4-available/ (Vendor Advisory)
www.exploit-db.com/exploits/44247/ (Exploit, VDB Entry, Third Party Advisory, exploit)

Frequently asked questions

What is CVE-2018-6794?: CVE-2018-6794 is a medium-severity vulnerability in Suricata-Ids Suricata, classified under Protection Mechanism Failure. CVSS score: 5.3/10. Published 2018-02-07.
How severe is CVE-2018-6794?: Medium severity. CVSS v3 base score is 5.3 out of 10.
Is CVE-2018-6794 known to be exploited?: 5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.