An openssl security update has been released for Debian GNU/Linux 9 LTS to address a flaw in the GENERAL_NAME_cmp() function which could cause a NULL dereference, resulting in denial of service.

DLA 2492-1: openssl security update

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Debian LTS Advisory DLA-2492-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Emilio Pozuelo Monfort
December 14, 2020   https://wiki.debian.org/LTS
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Package : openssl
Version : 1.1.0l-1~deb9u2
CVE ID : CVE-2020-1971

David Benjamin discovered a flaw in the GENERAL_NAME_cmp() function
which could cause a NULL dereference, resulting in denial of service.

For Debian 9 stretch, this problem has been fixed in version
1.1.0l-1~deb9u2.

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