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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…
Critical9.1EPSS 2.5%
- Published
- Updated
- Reserved
- Assigned by
- mitre
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Critical9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H |
- EPSS (exploitation in 30 days)
- 2.5% · top 15% of all CVEs (5 Nov 2026)
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The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.1.
Weakness
Affected products
n/a
- affected n/a
References (5)
- https://redmine.openinfosecfoundation.org/issues/3324 (opens in a new tab)x_refsource_MISCx_transferred
- https://github.com/OISF/suricata/commit/fa692df37a796c3330c81988d15ef1a219afc006 (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://redmine.openinfosecfoundation.org/issues/3394 (opens in a new tab)x_refsource_MISCx_transferred
- https://github.com/OISF/suricata/commit/1c63d3905852f746ccde7e2585600b2199cefb4b (opens in a new tab)x_refsource_CONFIRMx_transferred
- [debian-lts-announce] 20200130 [SECURITY] [DLA 2087-1] suricata security update (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2019-18792)Record last updated .