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CRITICAL

CVE-2019-20445

CVSS v3

9.1

CRITICAL

EPSS Score

13.8 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • io.netty:nettyMavenall versions · no fixed version listedand 1 other package
  • io.netty:netty-handlerMavenfrom 4.0.0 · fixed in 4.1.45

Vendor advisories

  • CVE-2019-20445 Red Hat Product Security467 products fixed · 10 known affected

    netty: HttpObjectDecoder.java allows Content-Length header to accompanied by second Content-Length header

    netty as a component of Red Hat JBoss A-MQ 6 · netty as a component of Red Hat JBoss Enterprise Application Platform 5 · netty as a component of Red Hat JBoss Enterprise Application Platform 6

  • RHSA-2024:5856 Red Hat Product Security3 products fixed

    Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.1.7 on RHEL 7 security update

  • RHSA-2021:3140 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Fuse 7.9.0 release and security update

  • RHSA-2020:3197 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Process Automation Manager 7.8.0 Security Update

  • RHSA-2020:3196 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Decision Manager 7.8.0 Security Update

  • RHSA-2020:3192 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Fuse 7.7.0 release and security update

15 more advisories

Full record on NVD

Description

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.

Technical details

Published
2020-01-29

Frequently asked questions

What is CVE-2019-20445?

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.

Is CVE-2019-20445 actively exploited?

Active exploitation of CVE-2019-20445 has not been confirmed. Its EPSS score was 13.8% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-20445?

CVE-2019-20445 has a CVSS v3 base score of 9.1 (CRITICAL severity).

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