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HIGH

CVE-2019-16869

CVSS v3

7.5

HIGH

EPSS Score

8.6 %

exploit probability, as of 2026-10-20

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:nettyMavenfrom 3.3.0.Final · no fixed version listed
  • io.netty:netty-allMavenfrom 4.0.0.Beta1 · fixed in 4.1.42.Final
  • org.jboss.netty:nettyMavenall versions · no fixed version listed

Vendor advisories

  • CVE-2019-16869 Red Hat Product Security319 products fixed · 3 known affected

    netty: HTTP request smuggling by mishandled whitespace before the colon in HTTP headers

    netty as a component of Red Hat JBoss Fuse 6 · openshift3/ose-logging-elasticsearch5 as a component of Red Hat OpenShift Container Platform 3.11 · openshift4/ose-logging-elasticsearch5 as a component of Red Hat OpenShift Container Platform 4

  • 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-2020:2333 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: EAP Continuous Delivery Technical Preview Release 19 security update

10 more advisories

Full record on NVD

Description

Netty before 4.1.42.Final mishandles whitespace before the colon in HTTP headers (such as a "Transfer-Encoding : chunked" line), which leads to HTTP request smuggling.

Technical details

Published
2019-09-26

Frequently asked questions

What is CVE-2019-16869?

Netty before 4.1.42.Final mishandles whitespace before the colon in HTTP headers (such as a "Transfer-Encoding : chunked" line), which leads to HTTP request smuggling.

Is CVE-2019-16869 actively exploited?

Active exploitation of CVE-2019-16869 has not been confirmed. Its EPSS score was 8.6% on 2026-10-20, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-16869?

CVE-2019-16869 has a CVSS v3 base score of 7.5 (HIGH severity).

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Same product first, then the same vendor advisory and the same publication week.

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