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Vulnerability record · CVE-2018-6794 · published 7 February 2018

CVE-2018-6794: Suricata-ids suricata vulnerability

SSuricata Ids · Suricata

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.

5.3 CVSS 3.0 Medium EPSS 24% · top 2.2% CWE-693 · CWE-693
5.3CVSS 3.0 base score, v2 5.0
24%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
10References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/OISF/suricata/pull/3202/commits/e1ef57c848bbe4e567d5d4b66d346a742e3f77a1 PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2018/12/msg00000.html Mailing ListThird Party Advisory
https://redmine.openinfosecfoundation.org/issues/2427 Third Party Advisory
https://suricata-ids.org/2018/02/14/suricata-4-0-4-available/ Vendor Advisory
https://www.exploit-db.com/exploits/44247/ ExploitThird Party AdvisoryVDB Entry
https://github.com/OISF/suricata/pull/3202/commits/e1ef57c848bbe4e567d5d4b66d346a742e3f77a1 PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2018/12/msg00000.html Mailing ListThird Party Advisory
https://redmine.openinfosecfoundation.org/issues/2427 Third Party Advisory
https://suricata-ids.org/2018/02/14/suricata-4-0-4-available/ Vendor Advisory
https://www.exploit-db.com/exploits/44247/ ExploitThird Party AdvisoryVDB Entry

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Source: NIST National Vulnerability Database (record CVE-2018-6794), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.