An openldap security update has been released for Debian GNU/Linux 9 LTS to address to a vulnerability in the Certificate List Exact Assertion validation.

DLA 2574-1: openldap security update

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Debian LTS Advisory DLA-2574-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Utkarsh Gupta
February 21, 2021   https://wiki.debian.org/LTS
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Package : openldap
Version : 2.4.44+dfsg-5+deb9u8
CVE ID : CVE-2021-27212

A vulnerability in the Certificate List Exact Assertion validation
was discovered in OpenLDAP, a free implementation of the Lightweight
Directory Access Protocol. An unauthenticated remote attacker can
take advantage of this flaw to cause a denial of service (slapd
daemon crash) via specially crafted packets.

For Debian 9 stretch, this problem has been fixed in version
2.4.44+dfsg-5+deb9u8.

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