An apache2 security update has been released for Debian GNU/Linux 9 LTS to address several vulnerabilities.

DLA 2960-1: apache2 security update

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Debian LTS Advisory DLA-2960-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Emilio Pozuelo Monfort
March 22, 2022   https://wiki.debian.org/LTS
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Package : apache2
Version : 2.4.25-3+deb9u13
CVE ID : CVE-2022-22719 CVE-2022-22720 CVE-2022-22721 CVE-2022-23943

Several vulnerabilities have been discovered in the Apache HTTP server,
which could result in denial of service, request smuggling or buffer
overflows.

For Debian 9 stretch, these problems have been fixed in version
2.4.25-3+deb9u13.

We recommend that you upgrade your apache2 packages.

For the detailed security status of apache2 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/apache2

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