CVE-2019-18792

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory published 2022-05-24. NVD baseline CVSS 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 3%CVSS: 9.1Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.1
EG Score
9.1(medium)
EPSS
83.2%
KEV
Not listed

Published

January 6, 2020

Last Modified

November 21, 2024

Advisory Details (5)

Auto-updated Jul 20, 2026
Patch available. Sources: github_commit.
generic

Security #3394: TCP evasion technique by overlapping a TCP segment with a fake packet (4.1.x) - Suricata - Open Information Security Foundation

https://redmine.openinfosecfoundation.org/issues/3394
generic

Security #3324: TCP evasion technique by overlapping a TCP segment with a fake packet - Suricata - Open Information Security Foundation

https://redmine.openinfosecfoundation.org/issues/3324
generic Patch Available

[SECURITY] [DLA 2087-1] suricata security update

https://lists.debian.org/debian-lts-announce/2020/01/msg00032.html
github_commit Patch Available

commit fa692df37a79 (OISF/suricata)

Patch available: OISF/suricata suricata-7.0.2 (contains commit fa692df37a79)

https://github.com/OISF/suricata/commit/fa692df37a796c3330c81988d15ef1a219afc006
github_commit

commit 1c63d3905852 (OISF/suricata)

Fix landed in OISF/suricata commit 1c63d3905852 — awaiting tagged release

https://github.com/OISF/suricata/commit/1c63d3905852f746ccde7e2585600b2199cefb4b

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 15× in last 7d / 45× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-22 14:05 UTCEPSS rescore
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  6. 2026-07-19 22:38 UTCOSV refresh
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  1. 2026-07-06 16:25 UTCEPSS rescore
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  6. 2026-07-02 12:50 UTCOSV refresh
  7. 2026-07-01 15:03 UTCEPSS rescore
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  62. 2026-05-27 09:36 UTCEG score recompute
  63. 2026-05-27 09:36 UTCGHSA enrichment
  64. 2026-05-26 13:42 UTCEPSS rescore
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  68. 2026-05-26 07:17 UTCEPSS rescore
  69. 2026-05-25 07:16 UTCOSV refresh

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Frequently asked(5)

What is CVE-2019-18792?
CVE-2019-18792 is a critical vulnerability published on January 6, 2020. 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…
When was CVE-2019-18792 disclosed?
CVE-2019-18792 was first published in the National Vulnerability Database on January 6, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2019-18792 actively exploited?
CVE-2019-18792 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 83.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2019-18792?
CVE-2019-18792 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2019-18792?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-18792, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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