An openldap security update has been released for Debian GNU/Linux 9 LTS to address a vulnerability in the handling of normalization with modrdn was discovered in OpenLDAP.

DLA 2425-1: openldap security update

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Debian LTS Advisory DLA-2425-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Utkarsh Gupta
November 01, 2020   https://wiki.debian.org/LTS
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Package : openldap
Version : 2.4.44+dfsg-5+deb9u5
CVE ID : none assigned yet

A vulnerability in the handling of normalization with modrdn was
discovered in OpenLDAP, a free implementation of the Lightweight
Directory Access Protocol. An unauthenticated remote attacker can
use this flaw to cause a denial of service (slapd daemon crash)
via a specially crafted packet.

For Debian 9 stretch, this problem has been fixed in version
2.4.44+dfsg-5+deb9u5.

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