An openssl security update has been released for Debian GNU/Linux 10 to address a flaw in the GENERAL_NAME_cmp() function which could cause a NULL dereference, resulting in denial of service.

DSA 4807-1: openssl security update

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Debian Security Advisory DSA-4807-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
December 08, 2020   https://www.debian.org/security/faq
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Package : openssl
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.

Additional details can be found in the upstream advisory:
  https://www.openssl.org/news/secadv/20201208.txt

For the stable distribution (buster), this problem has been fixed in
version 1.1.1d-0+deb10u4.

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 Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://www.debian.org/security/