Advisory Published

USN-4532-1: Netty vulnerabilities

First published: Tue Sep 22 2020(Updated: )

It was discovered that Netty incorrectly handled certain HTTP headers. By sending an HTTP header with whitespace before the colon, a remote attacker could possibly use this issue to perform an HTTP request smuggling attack. (CVE-2019-16869) It was discovered that Netty incorrectly handled certain HTTP headers. By sending an HTTP header that lacks a colon, a remote attacker could possibly use this issue to perform an HTTP request smuggling attack. (CVE-2019-20444) It was discovered that Netty incorrectly handled certain HTTP headers. By sending a Content-Length header accompanied by a second Content-Length header, or by a Transfer-Encoding header, a remote attacker could possibly use this issue to perform an HTTP request smuggling attack. (CVE-2019-20445)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/libnetty-3.9-java<3.9.9.Final-1+deb9u1build0.18.04.1
3.9.9.Final-1+deb9u1build0.18.04.1
=18.04

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Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID for the Netty vulnerability?

    The vulnerability ID for the Netty vulnerability is CVE-2019-16869.

  • How does the Netty vulnerability impact systems?

    The Netty vulnerability allows a remote attacker to perform an HTTP request smuggling attack.

  • What is the affected software for the Netty vulnerability?

    The affected software for the Netty vulnerability is libnetty-3.9-java version 3.9.9.Final-1+deb9u1build0.18.04.1 on Ubuntu 18.04.

  • How can I fix the Netty vulnerability?

    To fix the Netty vulnerability, update the libnetty-3.9-java package to version 3.9.9.Final-1+deb9u1build0.18.04.1 or later.

  • Where can I find more information about the Netty vulnerability?

    More information about the Netty vulnerability can be found on the Ubuntu Security website: <a href="https://ubuntu.com/security/CVE-2019-16869">https://ubuntu.com/security/CVE-2019-16869</a>.

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