A shiro security update has been released for Debian GNU/Linux 9 LTS to address two issues.

DLA 2726-1: shiro security update

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Debian LTS Advisory DLA-2726-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Roberto C. Sánchez
August 02, 2021   https://wiki.debian.org/LTS
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Package : shiro
Version : 1.3.2-1+deb9u2
CVE ID : CVE-2020-13933 CVE-2020-17510
Debian Bug : 968753

It was discovered that there were two issues in shiro, a security
framework for Java applications:

CVE-2020-13933

Fix an authentication bypass resulting from a specially
crafted HTTP request.

CVE-2020-17510

Fix an authentication bypass resulting from a specially
crafted HTTP request.

For Debian 9 stretch, these problems have been fixed in version
1.3.2-1+deb9u2.

We recommend that you upgrade your shiro packages.

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

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