An openssl security update has been released for Debian GNU/Linux 9 LTS to address a buffer overrun flaw.

DLA 2766-1: openssl security update

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Debian LTS Advisory DLA-2766-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Thorsten Alteholz
September 27, 2021   https://wiki.debian.org/LTS
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Package : openssl
Version : 1.1.0l-1~deb9u4
CVE ID : CVE-2021-3712

An issue has been found in openssl, a Secure Sockets Layer toolkit.
Ingo Schwarze reported a buffer overrun flaw when processing ASN.1
strings, which can result in denial of service.

For Debian 9 stretch, this problem has been fixed in version
1.1.0l-1~deb9u4.

We recommend that you upgrade your openssl packages.

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

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