---
id: CVE-2019-20445
title: >-
  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.
summary: >-
  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.
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-444
vendor: netty
product: netty
affected:
  - netty < 4.1.44
  - debian_linux = 8.0
  - debian_linux = 9.0
  - debian_linux = 10.0
  - fedora = 33
  - ubuntu_linux = 18.04
  - jboss_amq_clients = 2
  - jboss_enterprise_application_platform = 7.2
  - jboss_enterprise_application_platform = 7.3
  - spark = 2.4.7
  - spark = 2.4.8
patched:
  - netty 4.1.44
published: '2020-01-29'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T22:16:53.823'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2019-20445'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2020:0497'
    label: cve@mitre.org
  - url: 'https://access.redhat.com/errata/RHSA-2020:0567'
    label: cve@mitre.org
  - url: 'https://access.redhat.com/errata/RHSA-2020:0601'
    label: cve@mitre.org
  - url: 'https://access.redhat.com/errata/RHSA-2020:0605'
    label: cve@mitre.org
  - url: 'https://access.redhat.com/errata/RHSA-2020:0606'
    label: cve@mitre.org
  - url: 'https://access.redhat.com/errata/RHSA-2020:0804'
    label: cve@mitre.org
  - url: 'https://access.redhat.com/errata/RHSA-2020:0805'
    label: cve@mitre.org
  - url: 'https://access.redhat.com/errata/RHSA-2020:0806'
    label: cve@mitre.org
  - url: 'https://access.redhat.com/errata/RHSA-2020:0811'
    label: cve@mitre.org
  - url: >-
      https://github.com/netty/netty/compare/netty-4.1.43.Final...netty-4.1.44.Final
    label: cve@mitre.org
  - url: 'https://github.com/netty/netty/issues/9861'
    label: cve@mitre.org
  - url: >-
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    label: cve@mitre.org
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    label: cve@mitre.org
  - url: >-
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    label: cve@mitre.org
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    label: cve@mitre.org
  - url: >-
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    label: cve@mitre.org
  - url: >-
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    label: cve@mitre.org
  - url: >-
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  - url: >-
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    label: cve@mitre.org
  - url: >-
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  - url: >-
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    label: cve@mitre.org
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    label: cve@mitre.org
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    label: cve@mitre.org
  - url: >-
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    label: cve@mitre.org
  - url: >-
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    label: cve@mitre.org
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    label: cve@mitre.org
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    label: cve@mitre.org
  - url: >-
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    label: cve@mitre.org
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    label: cve@mitre.org
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    label: cve@mitre.org
  - url: 'https://lists.debian.org/debian-lts-announce/2020/02/msg00017.html'
    label: cve@mitre.org
  - url: 'https://lists.debian.org/debian-lts-announce/2020/02/msg00018.html'
    label: cve@mitre.org
  - url: 'https://lists.debian.org/debian-lts-announce/2020/09/msg00003.html'
    label: cve@mitre.org
  - url: 'https://lists.debian.org/debian-lts-announce/2020/09/msg00004.html'
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  - url: >-
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    label: cve@mitre.org
  - url: 'https://usn.ubuntu.com/4532-1/'
    label: cve@mitre.org
  - url: 'https://www.debian.org/security/2021/dsa-4885'
    label: cve@mitre.org
  - url: 'https://access.redhat.com/errata/RHSA-2020:0497'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://access.redhat.com/errata/RHSA-2020:0567'
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  - url: 'https://access.redhat.com/errata/RHSA-2020:0601'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://access.redhat.com/errata/RHSA-2020:0605'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://access.redhat.com/errata/RHSA-2020:0606'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://access.redhat.com/errata/RHSA-2020:0804'
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  - url: 'https://access.redhat.com/errata/RHSA-2020:0805'
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  - url: 'https://access.redhat.com/errata/RHSA-2020:0806'
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  - url: 'https://access.redhat.com/errata/RHSA-2020:0811'
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      https://lists.apache.org/thread.html/rf5b2dfb7401666a19915f8eaef3ba9f5c3386e2066fcd2ae66e16a2f%40%3Cdev.flink.apache.org%3E
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.apache.org/thread.html/rfb55f245b08d8a6ec0fb4dc159022227cd22de34c4419c2fbb18802b%40%3Cnotifications.zookeeper.apache.org%3E
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.apache.org/thread.html/rff210a24f3a924829790e69eaefa84820902b7b31f17c3bf2def9114%40%3Ccommits.druid.apache.org%3E
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2020/02/msg00017.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2020/02/msg00018.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2020/09/msg00003.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2020/09/msg00004.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TS6VX7OMXPDJIU5LRGUAHRK6MENAVJ46/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://usn.ubuntu.com/4532-1/'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.debian.org/security/2021/dsa-4885'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.13474
epssPercentile: 0.96351
ingestedAt: '2026-10-08T23:16:47.302Z'
---

## Overview

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.

## Affected

- `netty < 4.1.44`
- `debian_linux = 8.0`
- `debian_linux = 9.0`
- `debian_linux = 10.0`
- `fedora = 33`
- `ubuntu_linux = 18.04`
- `jboss_amq_clients = 2`
- `jboss_enterprise_application_platform = 7.2`
- `jboss_enterprise_application_platform = 7.3`
- `spark = 2.4.7`
- `spark = 2.4.8`

## Remediation

Upgrade past the affected range:

- `netty 4.1.44`