An openssl security update has been released for Debian GNU/Linux 10 to address a potential denial of service issue.

DSA 4875-1: openssl security update

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Debian Security Advisory DSA-4875-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
March 25, 2021   https://www.debian.org/security/faq
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Package : openssl
CVE ID : CVE-2021-3449

A NULL pointer dereference was found in the signature_algorithms
processing in OpenSSL, a Secure Sockets Layer toolkit, which could
result in denial of service.

Additional details can be found in the upstream advisory:
  https://www.openssl.org/news/secadv/20210325.txt

For the stable distribution (buster), this problem has been fixed in
version 1.1.1d-0+deb10u6.

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/