Debian Security Advisory

DLA-2109-1 netty -- LTS security update

Date Reported:
19 Feb 2020
Affected Packages:
Security database references:
In the Debian bugtracking system: Bug 950966, Bug 950967.
In Mitre's CVE dictionary: CVE-2019-20444, CVE-2019-20445, CVE-2020-7238.
More information:

Several vulnerabilities were discovered in the HTTP server provided by Netty, a Java NIO client/server socket framework:

  • CVE-2019-20444 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."

  • CVE-2019-20445 allows a Content-Length header to be accompanied by a second Content-Length header, or by a Transfer-Encoding header.

  • CVE-2020-7238

    Netty allows HTTP Request Smuggling because it mishandles Transfer-Encoding whitespace (such as a [space]Transfer-Encoding:chunked line) and a later Content-Length header.

For Debian 8 Jessie, these problems have been fixed in version 1:3.2.6.Final-2+deb8u2.

We recommend that you upgrade your netty packages.

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: