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AUSCERT External Security Bulletin Redistribution
Jenkins Security Advisory 2021-04-20
21 April 2021
AusCERT Security Bulletin Summary
Product: Jenkins Core
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2021-28165
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Jenkins Security Advisory 2021-04-20
This advisory announces vulnerabilities in the following Jenkins deliverables:
o Jenkins (core)
Denial of service vulnerability in bundled Jetty
JENKINS-65280 / CVE-2021-28165
Jenkins bundles Winstone-Jetty, a wrapper around Jetty, to act as HTTP and
servlet server when started using java -jar jenkins.war. This is how Jenkins is
run when using any of the installers or packages, but not when run using
servlet containers such as Tomcat.
Jenkins 2.285 and earlier, LTS 2.277.2 and earlier bundles Jetty 9.4.38 or
earlier with multiple security vulnerabilities, including CVE-2021-28165. This
vulnerability may allow unauthenticated attackers to cause a denial of service
if Winstone-Jetty is configured to handle SSL/TLS connections.
Jenkins LTS 2.277.3 updates the bundled Jetty to 9.4.39. Jetty was already
previously updated to 9.4.39 in the 2.286 weekly release.
o JENKINS-65280: High
o Jenkins weekly up to and including 2.285
o Jenkins LTS up to and including 2.277.2
o Jenkins weekly should be updated to version 2.286
o Jenkins LTS should be updated to version 2.277.3
These versions include fixes to the vulnerabilities described above. All prior
versions are considered to be affected by these vulnerabilities unless
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