A php7.0 security update has been released for Debian GNU/Linux 9 LTS to address an out-of-bounds read and write flaw in the PHP-FPM code.

DLA 2794-1: php7.0 security update

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Debian LTS Advisory DLA-2794-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Sylvain Beucler
October 27, 2021   https://wiki.debian.org/LTS
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Package : php7.0
Version : 7.0.33-0+deb9u12
CVE ID : CVE-2021-21703
Debian Bug : 997003

An out-of-bounds read and write flaw was discovered in the PHP-FPM code,
which could result in escalation of privileges from local unprivileged
user to the root user.

For Debian 9 stretch, this problem has been fixed in version
7.0.33-0+deb9u12.

We recommend that you upgrade your php7.0 packages.

For the detailed security status of php7.0 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/php7.0

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