PT-2021-5550 · Openldap+7 · Openldap+7

Xerub · Published 2021-01-25 · Updated 2025-08-24 · CVE-2020-36230

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 assertion failure during syntactic analysis in the OpenLDAP implementation, which can be exploited by a remote attacker to cause a denial of service (DoS) by sending a specially crafted request to slapd. The vulnerability is associated with the X.509 DN parsing in decode.c ber next element.

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 slapd service 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:2021-06400

BIT-OPENLDAP-2020-36230

CVE-2020-36230

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-7713-1

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/-/tags/OPENLDAP_REL_ENG_2_4_57 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-36228 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2021:0693-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-36226 · Security Note
• https://bugs.openldap.org/show_bug.cgi?id=9423 · 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
• https://nvd.nist.gov/vuln/detail/CVE-2020-36223 · Security Note
• https://osv.dev/vulnerability/USN-4724-1 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-7713-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2021:0723-1 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-06400 · Security Note