CVE-2019-20445

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under NVD CVSS v3. EPSS exploit probability: 13% (96th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Trending — 3 sources updated this weekElevated
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 13%CVSS: 9.1Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

HttpObjectDecoder.java in Netty before 4.1.44 allows a Content-Length header to be accompanied by a second Content-Length header, or by a Transfer-Encoding header.

CVSS v3
9.1
EG Score
9.1CRITICALmedium confidence
EG Risk
72
EG Risk 72/100CISA 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%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; 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
13%
EPSS %ILE
96th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; 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 (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). 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 29, 2020

Last Modified

October 8, 2026

Advisory Details (10)

Auto-updated Jul 18, 2026
Patch available. Sources: redhat.
generic

Comparing netty-4.1.43.Final...netty-4.1.44.Final · netty/netty · GitHub

https://github.com/netty/netty/compare/netty-4.1.43.Final...netty-4.1.44.Final
redhatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2020:0811
redhatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 8.

https://access.redhat.com/errata/RHSA-2020:0806
redhatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 7.

https://access.redhat.com/errata/RHSA-2020:0805
redhatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 6.

https://access.redhat.com/errata/RHSA-2020:0804
redhatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2020:0606
redhatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 6, 7, and 8.

https://access.redhat.com/errata/RHSA-2020:0605
redhatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 6, 7, and 8.

https://access.redhat.com/errata/RHSA-2020:0601
redhatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2020:0567
redhatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2020:0497

Vendor Advisories for CVE-2019-20445(8)

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

Patch Availability(12)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulibnetty-3.9-java (3.9.9.Final-1+deb9u1build0.18.04.1) @ bionic2026-10-08ubuntu
ubuntulibnetty-3.9-java (3.9.0.Final-1ubuntu0.1) @ xenial2026-10-08ubuntu
ubuntulibnetty-java (1:4.1.7-4ubuntu0.1) @ bionic2026-10-08ubuntu
redhateap7-netty-0:4.1.45-1.Final_redhat_00001.1.ep7.el72024-08-26redhat
redhatkaraf-transaction-manager-narayana2021-08-11redhat
redhatnetty2020-07-29redhat
redhateap7-xml-security-0:2.1.4-1.redhat_00001.1.el8eap2020-03-12redhat
redhateap7-xml-security-0:2.1.4-1.redhat_00001.1.el7eap2020-03-12redhat
redhateap7-xml-security-0:2.1.4-1.redhat_00001.1.el6eap2020-03-12redhat
redhatpatch2020-02-25redhat
redhateap7-netty-0:4.1.45-1.Final_redhat_00001.1.el8eap2020-02-25redhat
redhatrubygem-qpid_proton-0:0.30.0-1.el82020-02-25redhat

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

(12 across 8 ecosystems)
Maven(3)
PackageVulnerable rangeFix by version rangeDependents
io.netty:netty3.10.0.Final ... 4.0.0.Alpha8 (71 versions)
  • every version on: no fix on record
—
io.netty:netty-handler4.0.0.Final ... 4.1.9.Final (118 versions)
  • 4.0.0 up to 4.1.45: fixed in 4.1.45
—
org.jboss.netty:netty3.0.0.CR1 ... 3.2.9.Final (39 versions)
  • every version on: no fix on record
—
Debian:8(2)
PackageVulnerable rangeFix by version rangeDependents
netty1:3.2.6.Final-2, 1:3.2.6.Final-2+deb8u1
  • every version up to 1:3.2.6.Final-2+deb8u2: fixed in 1:3.2.6.Final-2+deb8u2
—
netty-3.93.9.0.Final-1
  • every version up to 3.9.0.Final-1+deb8u1: fixed in 3.9.0.Final-1+deb8u1
—
Debian:9(2)
PackageVulnerable rangeFix by version rangeDependents
netty1:4.1.7-2, 1:4.1.7-2+deb9u1
  • every version up to 1:4.1.7-2+deb9u2: fixed in 1:4.1.7-2+deb9u2
—
netty-3.93.9.9.Final-1
  • every version up to 3.9.9.Final-1+deb9u1: fixed in 3.9.9.Final-1+deb9u1
—
Debian:10(1)
PackageVulnerable rangeFix by version rangeDependents
netty1:4.1.33-1, 1:4.1.33-1+deb10u1
  • every version up to 1:4.1.33-1+deb10u2: fixed in 1:4.1.33-1+deb10u2
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
netty—
  • every version up to 1:4.1.45-1: fixed in 1:4.1.45-1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
netty—
  • every version up to 1:4.1.45-1: fixed in 1:4.1.45-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
netty—
  • every version up to 1:4.1.45-1: fixed in 1:4.1.45-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
netty—
  • every version up to 1:4.1.45-1: fixed in 1:4.1.45-1
—

Weakness Classification(1)

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

Additional Vendor Advisories

(15)

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 9× in last 7d / 28× 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 157 total refreshes for this CVE.

  1. 2026-10-09 20:03 UTCEPSS rescore
  2. 2026-10-08 22:30 UTCVendor advisory
  3. 2026-10-08 21:34 UTCEG score recompute
  4. 2026-10-08 21:34 UTCVendor advisory
  5. 2026-10-08 16:37 UTCEPSS rescore
  6. 2026-10-07 23:43 UTCEPSS rescore
  7. 2026-10-06 15:12 UTCEPSS rescore
  8. 2026-10-05 17:39 UTCEPSS rescore
  9. 2026-10-03 14:22 UTCEPSS rescore
  10. 2026-09-30 14:59 UTCEPSS rescore
  11. 2026-09-30 10:16 UTCEG score recompute
  12. 2026-09-28 13:46 UTCEPSS rescore
  13. 2026-09-27 13:40 UTCEPSS rescore
  14. 2026-09-27 10:07 UTCOSV refresh
  15. 2026-09-26 15:54 UTCEPSS rescore
  16. 2026-09-26 15:54 UTCEPSS rescore
  17. 2026-09-26 00:20 UTCEPSS rescore
  18. 2026-09-24 13:59 UTCEPSS rescore
  19. 2026-09-23 13:43 UTCEPSS rescore
  20. 2026-09-22 14:43 UTCEPSS rescore
  21. 2026-09-21 20:28 UTCEPSS rescore
  22. 2026-09-18 19:22 UTCEPSS rescore
  23. 2026-09-17 19:22 UTCEPSS rescore
  24. 2026-09-16 14:04 UTCEPSS rescore
  25. 2026-09-15 03:05 UTCEPSS rescore
Show 75 more
  1. 2026-09-12 14:56 UTCEPSS rescore
  2. 2026-09-11 14:48 UTCEPSS rescore
  3. 2026-09-11 09:32 UTCEPSS rescore
  4. 2026-09-07 19:51 UTCOSV refresh
  5. 2026-09-07 15:57 UTCEPSS rescore
  6. 2026-09-06 13:44 UTCEPSS rescore
  7. 2026-09-05 15:24 UTCEPSS rescore
  8. 2026-09-04 13:56 UTCEPSS rescore
  9. 2026-09-02 14:07 UTCEPSS rescore
  10. 2026-09-01 03:32 UTCEPSS rescore
  11. 2026-08-30 19:13 UTCEPSS rescore
  12. 2026-08-30 01:18 UTCEPSS rescore
  13. 2026-08-28 21:36 UTCEPSS rescore
  14. 2026-08-27 14:21 UTCEPSS rescore
  15. 2026-08-26 14:42 UTCEPSS rescore
  16. 2026-08-25 13:45 UTCEPSS rescore
  17. 2026-08-24 14:11 UTCEPSS rescore
  18. 2026-08-21 23:45 UTCEPSS rescore
  19. 2026-08-21 05:44 UTCOSV refresh
  20. 2026-08-20 22:51 UTCEPSS rescore
  21. 2026-08-19 17:00 UTCEPSS rescore
  22. 2026-08-18 13:44 UTCEPSS rescore
  23. 2026-08-17 13:43 UTCEPSS rescore
  24. 2026-08-16 14:52 UTCEPSS rescore
  25. 2026-08-16 02:10 UTCEPSS rescore
  26. 2026-08-15 01:26 UTCEPSS rescore
  27. 2026-08-12 13:47 UTCEPSS rescore
  28. 2026-08-09 13:43 UTCEPSS rescore
  29. 2026-08-08 16:33 UTCEPSS rescore
  30. 2026-08-07 16:23 UTCEPSS rescore
  31. 2026-08-06 13:43 UTCEPSS rescore
  32. 2026-08-05 20:24 UTCOSV refresh
  33. 2026-08-05 19:13 UTCEPSS rescore
  34. 2026-08-04 15:05 UTCEPSS rescore
  35. 2026-08-02 02:23 UTCEPSS rescore
  36. 2026-08-01 04:12 UTCEPSS rescore
  37. 2026-07-30 16:24 UTCEPSS rescore
  38. 2026-07-30 01:27 UTCEPSS rescore
  39. 2026-07-28 15:32 UTCEPSS rescore
  40. 2026-07-26 14:51 UTCEPSS rescore
  41. 2026-07-25 14:14 UTCEPSS rescore
  42. 2026-07-24 14:14 UTCEPSS rescore
  43. 2026-07-24 14:14 UTCEPSS rescore
  44. 2026-07-23 14:15 UTCEPSS rescore
  45. 2026-07-23 01:43 UTCEG score recompute
  46. 2026-07-22 22:23 UTCEG score recompute
  47. 2026-07-22 14:05 UTCEPSS rescore
  48. 2026-07-21 15:22 UTCEPSS rescore
  49. 2026-07-21 15:22 UTCEPSS rescore
  50. 2026-07-20 17:04 UTCEPSS rescore
  51. 2026-07-20 17:04 UTCEPSS rescore
  52. 2026-07-19 20:48 UTCOSV refresh
  53. 2026-07-19 14:28 UTCEPSS rescore
  54. 2026-07-19 14:28 UTCEPSS rescore
  55. 2026-07-19 02:26 UTCEPSS rescore
  56. 2026-07-19 02:26 UTCEPSS rescore
  57. 2026-07-18 10:01 UTCEPSS rescore
  58. 2026-07-16 16:59 UTCEPSS rescore
  59. 2026-07-16 16:59 UTCEPSS rescore
  60. 2026-07-15 16:55 UTCEPSS rescore
  61. 2026-07-15 16:55 UTCEPSS rescore
  62. 2026-07-13 22:27 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 11:11 UTCOSV refresh

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Frequently asked(5)

What is CVE-2019-20445?
CVE-2019-20445 is a critical vulnerability published on January 29, 2020. HttpObjectDecoder.java in Netty before 4.1.44 allows a Content-Length header to be accompanied by a second Content-Length header, or by a Transfer-Encoding header.
When was CVE-2019-20445 disclosed?
CVE-2019-20445 was first published on January 29, 2020, with the most recent update on October 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2019-20445 actively exploited?
CVE-2019-20445 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 13% probability of exploitation in the next 30 days (96th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2019-20445?
CVE-2019-20445 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2019-20445?
A fix for CVE-2019-20445 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2019-20445 are linked in the Vendor Advisories panel on this page.

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