A php7.4 security update has been released for Debian GNU/Linux 11 to address two security issues.

DSA 5082-1: php7.4 security update

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Debian Security Advisory DSA-5082-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
February 18, 2022   https://www.debian.org/security/faq
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Package : php7.4
CVE ID : CVE-2021-21707 CVE-2021-21708

Two security issues were found in PHP, a widely-used open source general
purpose scripting language which could result in information disclosure
or denial of service.

For the stable distribution (bullseye), these problems have been fixed in
version 7.4.28-1+deb11u1.

We recommend that you upgrade your php7.4 packages.

For the detailed security status of php7.4 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/php7.4

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/