CVE-2018-6794
Suricata before 4.0.4 is prone to an HTTP detection bypass vulnerability in detect.c and stream-tcp.c.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 23.7%, higher than 98% of all known CVEs. Patch or mitigate before the next change window.
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
- 5.3 MEDIUMCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- EPSS
- 23.69% probability · 98th percentile
- Public exploits
- 1 in Exploit-DB · first 5 March 2018
- CISA KEV
- Not listed
- Weakness
- CWE-693
- Affected
- suricata-ids/suricata · debian/debian linux
- Source
- cve@mitre.org
EPSS 23.7% since 27 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
Public exploits (1)
Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.
References
- https://github.com/OISF/suricata/pull/3202/commits/e1ef57c848bbe4e567d5d4b66d346a742e3f77a1Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/12/msg00000.htmlMailing List, Third Party Advisory
- https://redmine.openinfosecfoundation.org/issues/2427Third Party Advisory
- https://suricata-ids.org/2018/02/14/suricata-4-0-4-available/Vendor Advisory
- https://www.exploit-db.com/exploits/44247/Exploit, Third Party Advisory, VDB Entry
- https://github.com/OISF/suricata/pull/3202/commits/e1ef57c848bbe4e567d5d4b66d346a742e3f77a1Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/12/msg00000.htmlMailing List, Third Party Advisory
- https://redmine.openinfosecfoundation.org/issues/2427Third Party Advisory
- https://suricata-ids.org/2018/02/14/suricata-4-0-4-available/Vendor Advisory
- https://www.exploit-db.com/exploits/44247/Exploit, Third Party Advisory, VDB Entry
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.