A nginx security update has been released for Debian GNU/Linux 10 to address an off-by-one, which could result in denial of service and potentially the execution of arbitrary code.

DSA 4921-1: nginx security update

- -------------------------------------------------------------------------
Debian Security Advisory DSA-4921-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
May 28, 2021   https://www.debian.org/security/faq
- -------------------------------------------------------------------------

Package : nginx
CVE ID : CVE-2021-23017
Debian Bug : 989095

Luis Merino, Markus Vervier and Eric Sesterhenn discovered an off-by-one
in Nginx, a high-performance web and reverse proxy server, which could
result in denial of service and potentially the execution of arbitrary
code.

For the stable distribution (buster), this problem has been fixed in
version 1.14.2-2+deb10u4.

We recommend that you upgrade your nginx packages.

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

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/