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
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2.5%CVSS: 9.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
9.1CRITICALmedium confidence
EG Risk
46
EG Risk 46/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity91% × 45%
Exploitation3% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
2.5%
EPSS %ILE
84th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

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
genericMentions a patch (unverified)

[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

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
suricata—
  • every version up to 1:5.0.2-1: fixed in 1:5.0.2-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
suricata—
  • every version up to 1:5.0.2-1: fixed in 1:5.0.2-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
suricata—
  • every version up to 1:5.0.2-1: fixed in 1:5.0.2-1
—
Debian:8(1)
PackageVulnerable rangeFix by version rangeDependents
suricata2.0.7-2, 2.0.7-2+deb8u1, 2.0.7-2+deb8u2, 2.0.7-2+deb8u3, 2.0.7-2+deb8u4
  • every version up to 2.0.7-2+deb8u5: fixed in 2.0.7-2+deb8u5
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 27× 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.

Showing the most recent 100 of 163 total refreshes for this CVE.

  1. 2026-10-09 20:03 UTCEPSS rescore
  2. 2026-10-08 16:37 UTCEPSS rescore
  3. 2026-10-07 23:43 UTCEPSS rescore
  4. 2026-10-06 15:12 UTCEPSS rescore
  5. 2026-10-05 17:39 UTCEPSS rescore
  6. 2026-10-03 14:22 UTCEPSS rescore
  7. 2026-09-30 14:59 UTCEPSS rescore
  8. 2026-09-30 10:14 UTCEG score recompute
  9. 2026-09-28 13:46 UTCEPSS rescore
  10. 2026-09-27 13:40 UTCEPSS rescore
  11. 2026-09-27 12:20 UTCOSV refresh
  12. 2026-09-26 15:54 UTCEPSS rescore
  13. 2026-09-26 15:54 UTCEPSS rescore
  14. 2026-09-26 00:20 UTCEPSS rescore
  15. 2026-09-24 13:59 UTCEPSS rescore
  16. 2026-09-23 13:43 UTCEPSS rescore
  17. 2026-09-22 14:43 UTCEPSS rescore
  18. 2026-09-21 20:28 UTCEPSS rescore
  19. 2026-09-20 20:10 UTCEPSS rescore
  20. 2026-09-18 19:22 UTCEPSS rescore
  21. 2026-09-17 19:22 UTCEPSS rescore
  22. 2026-09-16 14:04 UTCEPSS rescore
  23. 2026-09-15 03:05 UTCEPSS rescore
  24. 2026-09-13 16:42 UTCEPSS rescore
  25. 2026-09-12 14:56 UTCEPSS rescore
Show 75 more
  1. 2026-09-11 14:48 UTCEPSS rescore
  2. 2026-09-11 09:32 UTCEPSS rescore
  3. 2026-09-07 21:48 UTCOSV refresh
  4. 2026-09-07 15:57 UTCEPSS rescore
  5. 2026-09-06 13:44 UTCEPSS rescore
  6. 2026-09-05 15:24 UTCEPSS rescore
  7. 2026-09-04 13:56 UTCEPSS rescore
  8. 2026-09-02 14:07 UTCEPSS rescore
  9. 2026-09-01 03:32 UTCEPSS rescore
  10. 2026-08-30 19:13 UTCEPSS rescore
  11. 2026-08-30 01:18 UTCEPSS rescore
  12. 2026-08-28 21:36 UTCEPSS rescore
  13. 2026-08-27 14:21 UTCEPSS rescore
  14. 2026-08-26 14:42 UTCEPSS rescore
  15. 2026-08-25 13:45 UTCEPSS rescore
  16. 2026-08-24 14:11 UTCEPSS rescore
  17. 2026-08-21 23:45 UTCEPSS rescore
  18. 2026-08-21 07:44 UTCOSV refresh
  19. 2026-08-20 22:51 UTCEPSS rescore
  20. 2026-08-19 17:00 UTCEPSS rescore
  21. 2026-08-18 13:44 UTCEPSS rescore
  22. 2026-08-17 13:43 UTCEPSS rescore
  23. 2026-08-16 14:52 UTCEPSS rescore
  24. 2026-08-16 02:10 UTCEPSS rescore
  25. 2026-08-15 01:26 UTCEPSS rescore
  26. 2026-08-12 13:47 UTCEPSS rescore
  27. 2026-08-08 16:33 UTCEPSS rescore
  28. 2026-08-07 16:23 UTCEPSS rescore
  29. 2026-08-06 13:43 UTCEPSS rescore
  30. 2026-08-05 21:24 UTCOSV refresh
  31. 2026-08-05 19:13 UTCEPSS rescore
  32. 2026-08-04 15:05 UTCEPSS rescore
  33. 2026-08-02 02:23 UTCEPSS rescore
  34. 2026-08-01 04:12 UTCEPSS rescore
  35. 2026-07-30 16:24 UTCEPSS rescore
  36. 2026-07-30 01:27 UTCEPSS rescore
  37. 2026-07-28 15:32 UTCEPSS rescore
  38. 2026-07-26 14:51 UTCEPSS rescore
  39. 2026-07-25 14:14 UTCEPSS rescore
  40. 2026-07-24 14:14 UTCEPSS rescore
  41. 2026-07-24 14:14 UTCEPSS rescore
  42. 2026-07-23 14:15 UTCEPSS rescore
  43. 2026-07-23 01:42 UTCEG score recompute
  44. 2026-07-22 22:22 UTCEG score recompute
  45. 2026-07-22 14:05 UTCEPSS rescore
  46. 2026-07-21 15:22 UTCEPSS rescore
  47. 2026-07-21 15:22 UTCEPSS rescore
  48. 2026-07-20 17:04 UTCEPSS rescore
  49. 2026-07-20 17:04 UTCEPSS rescore
  50. 2026-07-19 22:38 UTCOSV refresh
  51. 2026-07-19 14:28 UTCEPSS rescore
  52. 2026-07-19 14:28 UTCEPSS rescore
  53. 2026-07-19 02:26 UTCEPSS rescore
  54. 2026-07-19 02:26 UTCEPSS rescore
  55. 2026-07-18 10:01 UTCEPSS rescore
  56. 2026-07-16 16:59 UTCEPSS rescore
  57. 2026-07-16 16:59 UTCEPSS rescore
  58. 2026-07-15 16:55 UTCEPSS rescore
  59. 2026-07-15 16:55 UTCEPSS rescore
  60. 2026-07-13 22:27 UTCEPSS rescore
  61. 2026-07-13 06:10 UTCEPSS rescore
  62. 2026-07-13 06:10 UTCEPSS rescore
  63. 2026-07-12 05:43 UTCEPSS rescore
  64. 2026-07-12 05:43 UTCEPSS rescore
  65. 2026-07-11 08:24 UTCEPSS rescore
  66. 2026-07-11 08:24 UTCEPSS rescore
  67. 2026-07-09 19:06 UTCEPSS rescore
  68. 2026-07-08 15:11 UTCEPSS rescore
  69. 2026-07-07 13:43 UTCEPSS rescore
  70. 2026-07-06 16:25 UTCEPSS rescore
  71. 2026-07-06 16:25 UTCEPSS rescore
  72. 2026-07-06 02:20 UTCEPSS rescore
  73. 2026-07-05 02:27 UTCEPSS rescore
  74. 2026-07-04 06:28 UTCEPSS rescore
  75. 2026-07-02 12:50 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 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 2.5% probability of exploitation in the next 30 days (84th percentile of EPSS-scored CVEs).
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?
A fix for CVE-2019-18792 is available: update to the fixed version the vendor names in its advisory.

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