PT-2021-5555 · Openldap+7 · Openldap+7

Published 2021-01-25 · Updated 2025-08-17 · CVE-2020-36222

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions OpenLDAP versions prior to 2.4.57

Description The issue is related to an insufficient use of the assert() function in the open implementation of the OpenLDAP protocol. It may allow a remote attacker to execute a denial of service attack by sending a specially crafted packet with a short timestamp. The flaw leads to an assertion failure in slapd in the saslAuthzTo validation.

Recommendations For versions prior to 2.4.57, update to version 2.4.57 or later to resolve the issue. As a temporary workaround, consider restricting access to the saslAuthzTo validation in slapd to minimize the risk of exploitation.

Fix

DoS

Assertion Failure

Weakness Enumeration

CWE-617

Related Identifiers

ALT-PU-2021-1333

ALT-PU-2021-1352

ALT-PU-2021-1354

BDU:2021-06405

BIT-OPENLDAP-2020-36222

CVE-2020-36222

DLA-2544-1

DSA-4845-1

MGASA-2021-0105

OESA-2021-1062

OPENSUSE-SU-2021:0408-1

OPENSUSE-SU-2021_0408-1

ROSA-SA-2025-2550

SUSE-SU-2021:0692-1

SUSE-SU-2021:0693-1

SUSE-SU-2021:0723-1

SUSE-SU-2021:14700-1

SUSE-SU-2021_14700-1

USN-4724-1

USN-7698-1

Affected Products

Alt Linux

Astra Linux

Linuxmint

Apple Macos

Openldap

Red Os

Suse

Ubuntu

References · 109

• https://nvd.nist.gov/vuln/detail/CVE-2020-36230 · Security Note
• https://git.openldap.org/openldap/openldap/-/commit/02dfc32d658fadc25e4040f78e36592f6e1e1ca0 · Vendor Advisory
• https://git.openldap.org/openldap/openldap/-/tags/OPENLDAP_REL_ENG_2_4_57 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-36228 · Vendor Advisory
• https://osv.dev/vulnerability/ALPINE-CVE-2020-36222 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2021:0693-1 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2020-36222 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-36226 · Security Note
• https://git.openldap.org/openldap/openldap/-/commit/6ed057b5b728b50746c869bcc9c1f85d0bbbf6ed · Vendor Advisory
• https://bugs.openldap.org/show_bug.cgi?id=9407 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2020-36222 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-36228 · Security Note
• https://osv.dev/vulnerability/DLA-2544-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-36226 · Vendor Advisory
• https://debian.org/security/2021/dsa-4845 · Vendor Advisory