HOMEVULNERABILITIESCVE-2018-6794
MEDIUMPOC

CVE-2018-6794

CWE-693Published: February 7, 2018· Updated: Jun 17, 2026

5.3
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2018-6794 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A proof-of-concept (PoC) exploit exists for CVE-2018-6794. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityLow
AvailabilityNone
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected Vendors & Products

Debian1 product(s)
debian linux
suricata-ids1 product(s)
suricata
Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

POC AVAILABLEProof-of-concept code exists
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/OISF/suricata/pull/3202/commits/e1ef57c848bbe4e567d5d4b66d346a742e3f77a1
PATCHhttps://github.com/OISF/suricata/pull/3202/commits/e1ef57c848bbe4e567d5d4b66d346a742e3f77a1
ADVISORYhttps://lists.debian.org/debian-lts-announce/2018/12/msg00000.html
ADVISORYhttps://redmine.openinfosecfoundation.org/issues/2427
ADVISORYhttps://suricata-ids.org/2018/02/14/suricata-4-0-4-available/
ADVISORYhttps://www.exploit-db.com/exploits/44247/
ADVISORYhttps://lists.debian.org/debian-lts-announce/2018/12/msg00000.html
ADVISORYhttps://redmine.openinfosecfoundation.org/issues/2427
ADVISORYhttps://suricata-ids.org/2018/02/14/suricata-4-0-4-available/
ADVISORYhttps://www.exploit-db.com/exploits/44247/

All References (10)

→
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

Quick Facts

CVE IDCVE-2018-6794
CVSS Score5.3 / 10
SeverityMEDIUM
WeaknessCWE-693
CISA KEVNo
ExploitPOC
Affected2 vendor(s)
PublishedFeb 7, 2018

Related CVEs (CWE-693)

CVE-2026-34938
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CVE-2022-35978
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CVE-2026-47140
10.0
CVE-2026-34208
10.0
CVE-2026-25115
9.9
CVE-2019-10328
9.9

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2018-6794 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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