An openssl1.0 security update has been released for Debian GNU/Linux 9 LTS to address an issue that can cause read buffer overruns.

DLA 2774-1: openssl1.0 security update

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Debian LTS Advisory DLA-2774-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Thorsten Alteholz
September 30, 2021   https://wiki.debian.org/LTS
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Package : openssl1.0
Version : 1.0.2u-1~deb9u6
CVE ID : CVE-2021-3712

An issue has been found in openssl1.0, a Secure Sockets Layer library.
The issue is related to read buffer overruns while processing ASN.1
strings.

For Debian 9 stretch, this problem has been fixed in version
1.0.2u-1~deb9u6.

We recommend that you upgrade your openssl1.0 packages.

For the detailed security status of openssl1.0 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/openssl1.0

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