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No exploitation reportedFix available

CVE-2019-18792

No exploitation reported by the sources we read.

  • Published2020-01-06
  • Fixed in4.1.6
  • WeaknessCWE-436

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

An issue was discovered in Suricata 5.0.0. It is possible to bypass/evade any tcp based signature by overlapping a TCP segment with a fake FIN packet. The fake FIN packet is injected just before the PUSH ACK packet we want to bypass. The PUSH ACK packet (containing the data) will be ignored by Suricata because it overlaps the FIN packet (the sequence and ack number are identical in the two packets). The client will ignore the fake FIN packet because the ACK flag is not set. Both linux and windows clients are ignoring the injected packet.

Timeline

dates in UTC
  1. 2020-01-0618:15CVE publishedNVD

Versions per branch

NVD
Oisf suricata
BranchAffectedFixed in
4.1≥ 4.1.5, < 4.1.64.1.6
5.0= 5.0.0no fix published
Debian debian linux
BranchAffectedFixed in
8.0= 8.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • suricataUbuntu:18.04:LTSall versions · no fixed version listed
  • suricataUbuntu:16.04:LTSall versions · no fixed version listed
  • suricataDebian:14all versions · fixed in 1:5.0.2-1
  • suricataDebian:13all versions · fixed in 1:5.0.2-1
  • suricataDebian:8all versions · fixed in 2.0.7-2+deb8u5

Full record on NVD

Fix

  1. Update Oisf suricata to 4.1.6

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Published
2020-01-06
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-p4hg-mvq8-47jj

Frequently asked questions

What is CVE-2019-18792?

An issue was discovered in Suricata 5.0.0. It is possible to bypass/evade any tcp based signature by overlapping a TCP segment with a fake FIN packet. The fake FIN packet is injected just before the PUSH ACK packet we want to bypass. The PUSH ACK packet (containing the data) will be ignored by Suricata because it overlaps the FIN packet (the sequence and ack number are identical in the two packets). The client will ignore the fake FIN packet because the ACK flag is not set. Both linux and windows clients are ignoring the injected packet.

Is CVE-2019-18792 actively exploited?

Active exploitation of CVE-2019-18792 has not been confirmed. Its EPSS score was 2.5% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-18792?

CVE-2019-18792 has a CVSS v3 base score of 9.1 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H.

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