A nginx security update has been released for Debian GNU/Linux 9 LTS to address a denial of service issue.

DLA 2670-1: nginx security update

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Debian LTS Advisory DLA-2670-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Utkarsh Gupta
May 30, 2021   https://wiki.debian.org/LTS
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Package : nginx
Version : 1.10.3-1+deb9u6
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 Debian 9 stretch, this problem has been fixed in version
1.10.3-1+deb9u6.

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 LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS