An openldap security update has been released for both Debian GNU/Linux 9 and 10.

DSA 4666-1: openldap security update

- -------------------------------------------------------------------------
Debian Security Advisory DSA-4666-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
April 28, 2020   https://www.debian.org/security/faq
- -------------------------------------------------------------------------

Package : openldap
CVE ID : CVE-2020-12243

A vulnerability was discovered in OpenLDAP, a free implementation of the
Lightweight Directory Access Protocol. LDAP search filters with nested
boolean expressions can result in denial of service (slapd daemon
crash).

For the oldstable distribution (stretch), this problem has been fixed
in version 2.4.44+dfsg-5+deb9u4.

For the stable distribution (buster), this problem has been fixed in
version 2.4.47+dfsg-3+deb10u2.

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/