CVE-2018-6794

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2022-05-14. NVD baseline CVSS 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 24%CVSS: 5.3Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
44
EG Risk 44/100CISA 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
Severity53% × 45%
Exploitation40% × 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
24%
EPSS %ILE
97th
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 public PoC (EG-KEV: elevated) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 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

February 7, 2018

Last Modified

November 21, 2024

References (10)

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
suricata—
  • every version up to 1:4.0.4-1: fixed in 1:4.0.4-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
suricata—
  • every version up to 1:4.0.4-1: fixed in 1:4.0.4-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
suricata—
  • every version up to 1:4.0.4-1: fixed in 1:4.0.4-1
—
Debian:8(1)
PackageVulnerable rangeFix by version rangeDependents
suricata2.0.7-2, 2.0.7-2+deb8u1, 2.0.7-2+deb8u2
  • every version up to 2.0.7-2+deb8u3: fixed in 2.0.7-2+deb8u3
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 25× 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 146 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 23:42 UTCEPSS rescore
  4. 2026-10-06 15:12 UTCEPSS rescore
  5. 2026-10-05 17:39 UTCEPSS rescore
  6. 2026-10-04 23:18 UTCEPSS rescore
  7. 2026-10-03 14:21 UTCEPSS rescore
  8. 2026-10-01 19:44 UTCEPSS rescore
  9. 2026-09-30 14:59 UTCEPSS rescore
  10. 2026-09-30 10:03 UTCEG score recompute
  11. 2026-09-29 09:53 UTCOSV refresh
  12. 2026-09-28 13:46 UTCEPSS rescore
  13. 2026-09-27 13:40 UTCEPSS rescore
  14. 2026-09-26 15:53 UTCEPSS rescore
  15. 2026-09-24 13:59 UTCEPSS rescore
  16. 2026-09-23 13:42 UTCEPSS rescore
  17. 2026-09-21 20:27 UTCEPSS rescore
  18. 2026-09-19 15:36 UTCEPSS rescore
  19. 2026-09-18 19:22 UTCEPSS rescore
  20. 2026-09-17 19:22 UTCEPSS rescore
  21. 2026-09-15 03:05 UTCEPSS rescore
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  23. 2026-09-13 16:42 UTCEPSS rescore
  24. 2026-09-11 14:48 UTCEPSS rescore
  25. 2026-09-11 09:32 UTCEPSS rescore
Show 75 more
  1. 2026-09-09 18:23 UTCOSV refresh
  2. 2026-09-06 13:44 UTCEPSS rescore
  3. 2026-09-04 13:56 UTCEPSS rescore
  4. 2026-09-04 05:02 UTCEPSS rescore
  5. 2026-09-02 14:07 UTCEPSS rescore
  6. 2026-09-01 03:32 UTCEPSS rescore
  7. 2026-08-30 19:13 UTCEPSS rescore
  8. 2026-08-30 01:18 UTCEPSS rescore
  9. 2026-08-28 21:36 UTCEPSS rescore
  10. 2026-08-27 14:21 UTCEPSS rescore
  11. 2026-08-26 14:42 UTCEPSS rescore
  12. 2026-08-25 13:45 UTCEPSS rescore
  13. 2026-08-24 14:11 UTCEPSS rescore
  14. 2026-08-22 23:07 UTCOSV refresh
  15. 2026-08-21 23:45 UTCEPSS rescore
  16. 2026-08-20 22:51 UTCEPSS rescore
  17. 2026-08-19 17:00 UTCEPSS rescore
  18. 2026-08-18 13:44 UTCEPSS rescore
  19. 2026-08-16 14:52 UTCEPSS rescore
  20. 2026-08-16 02:10 UTCEPSS rescore
  21. 2026-08-15 01:26 UTCEPSS rescore
  22. 2026-08-13 21:56 UTCEPSS rescore
  23. 2026-08-12 13:47 UTCEPSS rescore
  24. 2026-08-08 16:32 UTCEPSS rescore
  25. 2026-08-07 16:23 UTCEPSS rescore
  26. 2026-08-07 02:26 UTCOSV refresh
  27. 2026-08-06 13:42 UTCEPSS rescore
  28. 2026-08-04 15:05 UTCEPSS rescore
  29. 2026-08-01 04:12 UTCEPSS rescore
  30. 2026-07-30 16:24 UTCEPSS rescore
  31. 2026-07-30 01:27 UTCEPSS rescore
  32. 2026-07-28 15:32 UTCEPSS rescore
  33. 2026-07-26 14:51 UTCEPSS rescore
  34. 2026-07-25 14:14 UTCEPSS rescore
  35. 2026-07-25 14:14 UTCEPSS rescore
  36. 2026-07-24 14:14 UTCEPSS rescore
  37. 2026-07-24 14:14 UTCEPSS rescore
  38. 2026-07-23 14:15 UTCEPSS rescore
  39. 2026-07-23 14:15 UTCEPSS rescore
  40. 2026-07-23 01:37 UTCEG score recompute
  41. 2026-07-22 22:17 UTCEG score recompute
  42. 2026-07-22 14:05 UTCEPSS rescore
  43. 2026-07-21 17:48 UTCOSV refresh
  44. 2026-07-21 15:22 UTCEPSS rescore
  45. 2026-07-20 17:04 UTCEPSS rescore
  46. 2026-07-20 17:04 UTCEPSS rescore
  47. 2026-07-19 14:28 UTCEPSS rescore
  48. 2026-07-19 14:28 UTCEPSS rescore
  49. 2026-07-19 02:26 UTCEPSS rescore
  50. 2026-07-19 02:26 UTCEPSS rescore
  51. 2026-07-16 16:59 UTCEPSS rescore
  52. 2026-07-16 16:59 UTCEPSS rescore
  53. 2026-07-15 16:55 UTCEPSS rescore
  54. 2026-07-15 01:56 UTCEPSS rescore
  55. 2026-07-13 22:27 UTCEPSS rescore
  56. 2026-07-12 05:43 UTCEPSS rescore
  57. 2026-07-09 19:06 UTCEPSS rescore
  58. 2026-07-08 15:11 UTCEPSS rescore
  59. 2026-07-08 15:11 UTCEPSS rescore
  60. 2026-07-07 13:42 UTCEPSS rescore
  61. 2026-07-07 13:42 UTCEPSS rescore
  62. 2026-07-06 16:25 UTCEPSS rescore
  63. 2026-07-06 16:24 UTCEPSS rescore
  64. 2026-07-04 13:56 UTCOSV refresh
  65. 2026-07-04 06:28 UTCEPSS rescore
  66. 2026-07-04 06:28 UTCEPSS rescore
  67. 2026-07-01 15:03 UTCEPSS rescore
  68. 2026-07-01 15:03 UTCEPSS rescore
  69. 2026-06-29 14:03 UTCEPSS rescore
  70. 2026-06-28 04:53 UTCEPSS rescore
  71. 2026-06-28 04:53 UTCEPSS rescore
  72. 2026-06-27 03:06 UTCEPSS rescore
  73. 2026-06-27 03:06 UTCEPSS rescore
  74. 2026-06-25 13:47 UTCEPSS rescore
  75. 2026-06-25 13:47 UTCEPSS rescore

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-44247
    First seen Mar 5, 2018

    Suricata < 4.0.4 - IDS Detection Bypass

    Open source ↗

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2018-6794?
CVE-2018-6794 is a medium vulnerability published on February 7, 2018. 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…
When was CVE-2018-6794 disclosed?
CVE-2018-6794 was first published on February 7, 2018, 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-2018-6794 actively exploited?
CVE-2018-6794 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 24% probability of exploitation in the next 30 days (97th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2018-6794?
CVE-2018-6794 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2018-6794?
A fix for CVE-2018-6794 is available: update to the fixed version the vendor names in its advisory.

Dependency Blast Radius

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