A tomcat9 security update has been released for Debian GNU/Linux 10 to address two vulnerabilities.

DSA 4952-1: tomcat9 security update

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Debian Security Advisory DSA-4952-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
August 09, 2021   https://www.debian.org/security/faq
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Package : tomcat9
CVE ID : CVE-2021-30640 CVE-2021-33037
Debian Bug : 991046

Two vulnerabilities were discovered in the Tomcat servlet and JSP engine,
which could result in HTTP request smuggling, bypass of logout
restrictions or authentications using variations of a valid user name.

For the stable distribution (buster), these problems have been fixed in
version 9.0.31-1~deb10u5.

We recommend that you upgrade your tomcat9 packages.

For the detailed security status of tomcat9 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/tomcat9

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