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No exploitation reportedFix available

CVE-2019-20444

No exploitation reported by the sources we read.

  • Published2020-01-29
  • Fixed in4.1.44
  • WeaknessCWE-444

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

HttpObjectDecoder.java in Netty before 4.1.44 allows an HTTP header that lacks a colon, which might be interpreted as a separate header with an incorrect syntax, or might be interpreted as an "invalid fold."

Timeline

dates in UTC
  1. 2020-01-2921:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-11-04 09:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2019-20444?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2019-20444?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV
Netty
BranchAffectedFixed in
4.1< 4.1.444.1.44
netty
BranchAffectedFixed in
—all versionsno fix published
netty
BranchAffectedFixed in
—all versionsno fix published

5 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

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

  • apache-druidMinimOSall versions · no fixed version listedand 1 other package
  • apache-hiveCleanStartall versions · fixed in 3.1.3-r3
  • druidWolfiall versions · fixed in 34.0.0-r6
  • druidChainguardall versions · fixed in 34.0.0-r6
  • eap7-activemq-artemisRed Hat:jboss_enterprise_application_platform:7.2::el8all versions · fixed in 0:2.9.0-2.redhat_00009.1.el8eapand 15 other packages
  • eap7-activemq-artemisRed Hat:jboss_enterprise_application_platform:7.2::el7all versions · fixed in 0:2.9.0-2.redhat_00009.1.el7eapand 15 other packages
  • eap7-activemq-artemisRed Hat:jboss_enterprise_application_platform:7.2::el6all versions · fixed in 0:2.9.0-2.redhat_00009.1.el6eapand 15 other packages
  • eap7-apache-commons-beanutilsRed Hat:jboss_enterprise_application_platform:7.2::el8all versions · fixed in 0:1.9.4-1.redhat_00002.1.el8eap

113 more package ranges on OSV.dev

Vendor advisories

  • CVE-2019-20444 Red Hat Product Security466 products fixed · 11 known affected

    netty: HTTP request smuggling

    karaf-transaction-manager-narayana as a component of Red Hat Fuse 7 · netty as a component of Red Hat JBoss A-MQ 6 · netty as a component of Red Hat JBoss Enterprise Application Platform 5 · +8 more

  • 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-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

  • RHSA-2020:2333 Red Hat Product Security1 product fixed

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

14 more advisories

Full record on NVD

Fix

  1. Update Netty to 4.1.44
  2. Vendor fix Red Hat Product Security RHSA-2024:5856 · 3 productsBefore applying this update, ensure all previously released errata relevant to your system have been applied. Also, back up your existing installation, including all applications, configuration files, databases and database settings. For details on how to apply this update, refer to: https://access…
  3. Vendor fix Red Hat Product Security RHSA-2020:3197 · 1 productFor on-premise installations, before applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on. It is recommended to halt the server by stopping the JBoss Application Server process before installing this up…
  4. Vendor fix Red Hat Product Security RHSA-2020:3192 · 1 productBefore applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on. Installation instructions are available from the Fuse 7.7.0 product documentation page: https://access.redhat.com/documentation/en-us/red_hat…
  5. Vendor fix Red Hat Product Security RHSA-2020:2333 · 1 productBefore applying this update, back up your existing Red Hat JBoss Enterprise Application Platform installation and deployed applications. You must restart the JBoss server process for the update to take effect. The References section of this erratum contains a download link (you must log in to dow…
  6. Vendor fix Red Hat Product Security RHSA-2020:2321 · 1 productTo install this update, do the following: 1. Download the Data Grid 7.3.6 server patch from the customer portal. See the download link in the References section. 2. Back up your existing Data Grid installation. You should back up databases, configuration files, and so on. 3. Install the Data Grid …
  7. Vendor fix Red Hat Product Security RHSA-2020:1445 · 1 productBefore applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on. The References section of this erratum contains a download link (you must log in to download the update).

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Published
2020-01-29
Last Modified
2026-10-08
NVD status
Modified
GitHub Advisory
GHSA-cqqj-4p63-rrmm

Frequently asked questions

What is CVE-2019-20444?

HttpObjectDecoder.java in Netty before 4.1.44 allows an HTTP header that lacks a colon, which might be interpreted as a separate header with an incorrect syntax, or might be interpreted as an "invalid fold."

Is CVE-2019-20444 actively exploited?

Active exploitation of CVE-2019-20444 has not been confirmed. Its EPSS score was 8.9% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-20444?

CVE-2019-20444 has a CVSS v3 base score of 9.1 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

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