CVE-2019-18802

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-24. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

An issue was discovered in Envoy 1.12.0. An untrusted remote client may send an HTTP header (such as Host) with whitespace after the header content. Envoy will treat "header-value " as a different string from "header-value" so for example with the Host header "example.com " one could bypass "example.com" matchers.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
50(Track)
EG Risk 50/100SSVC: 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
Severity98% × 45%
Exploitation2% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
84%
KEV
Not listed

Published

December 13, 2019

Last Modified

November 21, 2024

Advisory Details (3)

Auto-updated Sep 13, 2026
Patch available. Sources: github.
generic

Redirecting to Google Groups

https://groups.google.com/forum/#%21forum/envoy-users
github Patch Available

Missing header whitespace trimming (HTTP/1) · Advisory · envoyproxy/envoy · GitHub

https://github.com/envoyproxy/envoy/security/advisories/GHSA-356m-vhw2-wcm4
generic

Commits · envoyproxy/envoy · GitHub

https://github.com/envoyproxy/envoy/commits/master

Vendor Advisories for CVE-2019-18802(1)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatservicemesh-proxy-0:1.0.3-1.el82019-12-11redhat

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.

Data Freshness Timeline

(refreshed 4× in last 7d / 22× 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 143 total refreshes for this CVE.

  1. 2026-09-18 19:22 UTCEPSS rescore
  2. 2026-09-17 19:22 UTCEPSS rescore
  3. 2026-09-16 14:04 UTCEPSS rescore
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  8. 2026-09-07 22:51 UTCOSV refresh
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  22. 2026-08-21 23:45 UTCEPSS rescore
  23. 2026-08-21 08:44 UTCOSV refresh
  24. 2026-08-20 22:51 UTCEPSS rescore
  25. 2026-08-19 17:00 UTCEPSS rescore
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  1. 2026-08-18 13:44 UTCEPSS rescore
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  3. 2026-08-16 14:52 UTCEPSS rescore
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  6. 2026-08-12 13:47 UTCEPSS rescore
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  10. 2026-08-06 13:43 UTCEPSS rescore
  11. 2026-08-05 21:54 UTCOSV refresh
  12. 2026-08-05 19:13 UTCEPSS rescore
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  20. 2026-07-25 14:14 UTCEPSS rescore
  21. 2026-07-24 14:14 UTCEPSS rescore
  22. 2026-07-24 14:14 UTCEPSS rescore
  23. 2026-07-23 14:15 UTCEPSS rescore
  24. 2026-07-23 01:42 UTCEG score recompute
  25. 2026-07-22 22:22 UTCEG score recompute
  26. 2026-07-22 14:05 UTCEPSS rescore
  27. 2026-07-21 15:22 UTCEPSS rescore
  28. 2026-07-21 15:22 UTCEPSS rescore
  29. 2026-07-20 17:04 UTCEPSS rescore
  30. 2026-07-20 17:04 UTCEPSS rescore
  31. 2026-07-20 00:18 UTCOSV refresh
  32. 2026-07-19 14:28 UTCEPSS rescore
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  34. 2026-07-19 02:26 UTCEPSS rescore
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  39. 2026-07-15 16:55 UTCEPSS rescore
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  41. 2026-07-13 22:27 UTCEPSS rescore
  42. 2026-07-13 06:10 UTCEPSS rescore
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  44. 2026-07-12 05:43 UTCEPSS rescore
  45. 2026-07-12 05:43 UTCEPSS rescore
  46. 2026-07-11 08:24 UTCEPSS rescore
  47. 2026-07-11 08:24 UTCEPSS rescore
  48. 2026-07-09 19:06 UTCEPSS rescore
  49. 2026-07-08 15:11 UTCEPSS rescore
  50. 2026-07-07 13:43 UTCEPSS rescore
  51. 2026-07-06 16:25 UTCEPSS rescore
  52. 2026-07-06 16:25 UTCEPSS rescore
  53. 2026-07-06 02:20 UTCEPSS rescore
  54. 2026-07-05 02:27 UTCEPSS rescore
  55. 2026-07-04 06:28 UTCEPSS rescore
  56. 2026-07-02 15:21 UTCOSV refresh
  57. 2026-07-01 15:03 UTCEPSS rescore
  58. 2026-07-01 15:03 UTCEPSS rescore
  59. 2026-06-30 23:20 UTCEPSS rescore
  60. 2026-06-29 14:03 UTCEPSS rescore
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  62. 2026-06-28 04:54 UTCEPSS rescore
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  65. 2026-06-25 13:47 UTCEPSS rescore
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  69. 2026-06-23 21:31 UTCEPSS rescore
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  71. 2026-06-21 14:54 UTCEPSS rescore
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  73. 2026-06-21 01:57 UTCEPSS rescore
  74. 2026-06-21 01:57 UTCEPSS rescore
  75. 2026-06-19 19:23 UTCEPSS rescore

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redhat:RHSA-2019:4222

Frequently asked(5)

What is CVE-2019-18802?
CVE-2019-18802 is a critical vulnerability published on December 13, 2019. An issue was discovered in Envoy 1.12.0. An untrusted remote client may send an HTTP header (such as Host) with whitespace after the header content. Envoy will treat "header-value " as a different string from "header-value" so for example with the Host header "example.com " one could bypass…
When was CVE-2019-18802 disclosed?
CVE-2019-18802 was first published in the National Vulnerability Database on December 13, 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-2019-18802 actively exploited?
CVE-2019-18802 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 16.3% of all scored CVEs.
What is the CVSS score of CVE-2019-18802?
CVE-2019-18802 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2019-18802?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-18802, 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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