An openldap security update has been released for Debian GNU/Linux 10 to address several vulnerabilities.

DSA 4845-1: openldap security update

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Debian Security Advisory DSA-4845-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
February 03, 2021   https://www.debian.org/security/faq
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Package : openldap
CVE ID : CVE-2020-36221 CVE-2020-36222 CVE-2020-36223 CVE-2020-36224
CVE-2020-36225 CVE-2020-36226 CVE-2020-36227 CVE-2020-36228
CVE-2020-36229 CVE-2020-36230

Several vulnerabilities were discovered in OpenLDAP, a free
implementation of the Lightweight Directory Access Protocol. An
unauthenticated remote attacker can take advantage of these flaws to
cause a denial of service (slapd daemon crash, infinite loops) via
specially crafted packets.

For the stable distribution (buster), these problems have been fixed in
version 2.4.47+dfsg-3+deb10u5.

We recommend that you upgrade your openldap packages.

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

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/