CVE-2019-20444 HTTP Request Smuggling in Netty

What is CVE-2019-20444?

CVE-2019-20444 is a critical vulnerability in Canonical Ubuntu Linux, published on 29 Jan 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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."

Weakness: CWE-444

Which versions are affected by CVE-2019-20444?

6 open source packages ship an affected version, including io.netty:netty, io.netty:netty-codec-http and org.jboss.netty:netty. It affects 6 products.

Products include Canonical Ubuntu Linux, Debian Debian Linux, Fedoraproject Fedora, Netty Netty, Redhat Jboss Amq Clients, Redhat Jboss Enterprise Application Platform.

How do I fix CVE-2019-20444?

Upgrade to a fixed version.

Is CVE-2019-20444 being exploited?

There is no known exploitation of CVE-2019-20444 in the wild and no public exploit code.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2020-11651 SaltStack Salt Authentication Bypass Exploited Critical 9.8
• CVE-2020-7247 OpenSMTPD Remote Code Execution Exploited Critical 9.8
• CVE-2019-16928 Exim Out-of-bounds Write Exploited Critical 9.8
• CVE-2018-6789 Exim Buffer Overflow Exploited Critical 9.8
• CVE-2015-2590 Oracle Java SE and Java SE Embedded Remote Code Execution Exploited Critical 9.8

All Canonical Ubuntu Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as CLEANSTART-2026-LY33744, DEBIAN-CVE-2019-20444, GHSA-cqqj-4p63-rrmm, MINI-j29m-45rf-qpgv, MINI-x628-m8c6-m8fp, UBUNTU-CVE-2019-20444.