---
id: CVE-2020-25709
title: A flaw was found in OpenLDAP
summary: >-
  A flaw was found in OpenLDAP. This flaw allows an attacker who can send a
  malicious packet to be processed by OpenLDAP’s slapd server, to trigger an
  assertion failure. The highest threat from this vulnerability is to system
  availability.
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-617
vendor: openldap
product: openldap
affected:
  - openldap < 2.4.56
  - debian_linux = 9.0
  - debian_linux = 10.0
  - 'mac_os_x >= 10.14.0, < 10.14.6'
  - 'mac_os_x >= 10.15, < 10.15.7'
  - mac_os_x = 10.14.6
  - mac_os_x = 10.15.7
  - 'macos >= 11.0, < 11.0.1'
  - jboss_core_services
patched:
  - openldap 2.4.56
  - mac_os_x 10.15.7
  - macos 11.0.1
published: '2021-05-18'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T10:17:33.163'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2020-25709'
references:
  - url: 'http://seclists.org/fulldisclosure/2021/Feb/14'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=1899675'
    label: secalert@redhat.com
  - url: >-
      https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
    label: secalert@redhat.com
  - url: >-
      https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
    label: secalert@redhat.com
  - url: 'https://lists.debian.org/debian-lts-announce/2020/12/msg00008.html'
    label: secalert@redhat.com
  - url: 'https://security.netapp.com/advisory/ntap-20210716-0003/'
    label: secalert@redhat.com
  - url: 'https://support.apple.com/kb/HT212147'
    label: secalert@redhat.com
  - url: 'https://www.debian.org/security/2020/dsa-4792'
    label: secalert@redhat.com
  - url: 'http://seclists.org/fulldisclosure/2021/Feb/14'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=1899675'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2020/12/msg00008.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.netapp.com/advisory/ntap-20210716-0003/'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://support.apple.com/kb/HT212147'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.debian.org/security/2020/dsa-4792'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-398330.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
epss: 0.02858
epssPercentile: 0.86399
ingestedAt: '2026-10-14T10:25:41.189Z'
---

## Overview

A flaw was found in OpenLDAP. This flaw allows an attacker who can send a malicious packet to be processed by OpenLDAP’s slapd server, to trigger an assertion failure. The highest threat from this vulnerability is to system availability.

## Affected

- `openldap < 2.4.56`
- `debian_linux = 9.0`
- `debian_linux = 10.0`
- `mac_os_x >= 10.14.0, < 10.14.6`
- `mac_os_x >= 10.15, < 10.15.7`
- `mac_os_x = 10.14.6`
- `mac_os_x = 10.15.7`
- `macos >= 11.0, < 11.0.1`
- `jboss_core_services`

## Remediation

Upgrade past the affected range:

- `openldap 2.4.56`
- `mac_os_x 10.15.7`
- `macos 11.0.1`