An openldap security update has been released for Debian GNU/Linux 9 LTS to address two vulnerabilities.

DLA 2481-1: openldap security update

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Debian LTS Advisory DLA-2481-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Utkarsh Gupta
December 04, 2020   https://wiki.debian.org/LTS
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Package : openldap
Version : 2.4.44+dfsg-5+deb9u6
CVE ID : CVE-2020-25709 CVE-2020-25710

Two vulnerabilities in the certificate list syntax verification and
in the handling of CSN normalization 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) via
specially crafted packets.

For Debian 9 stretch, these problems have been fixed in version
2.4.44+dfsg-5+deb9u6.

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 LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS