A jetty9 security update has been released for Debian GNU/Linux 9 LTS.

DLA 2688-1: jetty9 security update

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Debian LTS Advisory DLA-2688-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Sylvain Beucler
June 17, 2021   https://wiki.debian.org/LTS
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Package : jetty9
Version : 9.2.30-0+deb9u2
CVE ID : CVE-2021-28169

Steven Seeley discovered that in jetty, a Java servlet engine and
webserver, requests to the ConcatServlet and WelcomeFilter are able to
access protected resources within the WEB-INF directory. An attacker
may access sensitive information regarding the implementation of a web
application.

For Debian 9 stretch, this problem has been fixed in version
9.2.30-0+deb9u2.

We recommend that you upgrade your jetty9 packages.

For the detailed security status of jetty9 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/jetty9

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