A modsecurity-apache security update has been released for Debian GNU/Linux 9 LTS to address a potential resource exhaustion attack issue.

DLA 3031-1: modsecurity-apache security update

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Debian LTS Advisory DLA-3031-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Chris Lamb
May 28, 2022   https://wiki.debian.org/LTS
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Package : modsecurity-apache
Version : 2.9.1-2+deb9u1
CVE ID : CVE-2021-42717

It was discovered that there was a potential resource exhaustion
attack in modsecurity-apache, an Apache module which inspects HTTP
requests with the aim of preventing typical web application attacks
such as XSS and SQL.

For Debian 9 "Stretch", this problem has been fixed in version
2.9.1-2+deb9u1.

We recommend that you upgrade your modsecurity-apache packages.

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

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