CVE-2019-18277

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2022-05-24. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 10%CVSS: 7.5Exploit: Elevated riskExposed: 0

A fix is available — apply it.

A flaw was found in HAProxy before 2.0.6. In legacy mode, messages featuring a transfer-encoding header missing the "chunked" value were not being correctly rejected. The impact was limited but if combined with the "http-reuse always" setting, it could be used to help construct an HTTP request smuggling attack against a vulnerable component employing a lenient parser that would ignore the content-length header as soon as it saw a transfer-encoding one (even if not entirely valid according to the specification).

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
54(Track)
EG Risk 54/100SSVC: Track

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
Severity75% × 45%
Exploitation40% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
10%
EPSS %ILE
95%
KEV
Not listed

Published

October 23, 2019

Last Modified

November 21, 2024

References (14)

Vendor Advisories for CVE-2019-18277(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(5)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuvim-haproxy (1.8.19-1ubuntu1.2) @ disco2026-05-27ubuntu
redhatrh-haproxy18-haproxy-0:1.8.24-2.el72020-05-26redhat
redhathaproxy-0:2.0.13-3.el72020-05-04redhat
redhathaproxy-0:1.8.23-3.el82020-04-28redhat
redhathaproxy-0:1.8.23-3.el72020-04-07redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
haproxy—2.0.6-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
haproxy—2.0.6-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
haproxy—2.0.6-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
haproxy—2.0.6-1—
Debian:9(1)
PackageVulnerable rangeFixed inDependents
haproxy1.7.5-21.7.5-2+deb9u1—

Weakness Classification(1)

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

Additional Vendor Advisories

(3)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 6× in last 7d / 23× 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 116 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2019-18277?
CVE-2019-18277 is a high vulnerability published on October 23, 2019. A flaw was found in HAProxy before 2.0.6. In legacy mode, messages featuring a transfer-encoding header missing the "chunked" value were not being correctly rejected. The impact was limited but if combined with the "http-reuse always" setting, it could be used to help construct an HTTP request…
When was CVE-2019-18277 disclosed?
CVE-2019-18277 was first published in the National Vulnerability Database on October 23, 2019, 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-2019-18277 actively exploited?
CVE-2019-18277 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 10% probability of exploitation in the next 30 days, which ranks it in the top 4.8% of all scored CVEs.
What is the CVSS score of CVE-2019-18277?
CVE-2019-18277 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2019-18277?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-18277, 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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