USN-4352-1: OpenLDAP vulnerability

6 May 2020

openldap vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 20.04 LTS
  • Ubuntu 19.10
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS


OpenLDAP could be made to crash if it received specially crafted network traffic.

Software Description

  • openldap - Lightweight Directory Access Protocol


It was discovered that OpenLDAP incorrectly handled certain queries. A remote attacker could possibly use this issue to cause OpenLDAP to consume resources, resulting in a denial of service.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 20.04 LTS
slapd - 2.4.49+dfsg-2ubuntu1.2
Ubuntu 19.10
slapd - 2.4.48+dfsg-1ubuntu1.1
Ubuntu 18.04 LTS
slapd - 2.4.45+dfsg-1ubuntu1.5
Ubuntu 16.04 LTS
slapd - 2.4.42+dfsg-2ubuntu3.8

To update your system, please follow these instructions:

In general, a standard system update will make all the necessary changes.