PT-2020-6566 · Openldap+8 · Openldap+8

Published 2020-11-02 · Updated 2026-03-11 · CVE-2020-25710

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions OpenLDAP versions prior to 2.4.56

Description A flaw in OpenLDAP allows an attacker to force a failed assertion in the csnNormalize23() function by sending a malicious packet. This can lead to a denial of service, affecting system availability. The vulnerability can be exploited remotely.

Recommendations For OpenLDAP versions prior to 2.4.56, update to version 2.4.56 or later to resolve the issue. As a temporary workaround, consider restricting access to the csnNormalize23() function until a patch is available.

Fix

Assertion Failure

Weakness Enumeration

CWE-617

Related Identifiers

ALT-PU-2020-3560

ALT-PU-2021-1352

ALT-PU-2021-1354

BDU:2022-00230

BIT-OPENLDAP-2020-25710

CESA-2022_0621

CVE-2020-25710

DLA-2481-1

DSA-4792-1

MGASA-2021-0046

OESA-2021-1244

OPENSUSE-SU-2021:0102-1

OPENSUSE-SU-2021:0107-1

OPENSUSE-SU-2021_0102-1

OPENSUSE-SU-2021_0107-1

RHSA-2022:0621

RHSA-2022_0621

SUSE-SU-2021:0128-1

SUSE-SU-2021:0129-1

SUSE-SU-2021:0142-1

SUSE-SU-2021:14597-1

SUSE-SU-2021_14597-1

USN-4634-1

USN-4634-2

Affected Products

Alt Linux

Astra Linux

Centos

Linuxmint

Openldap

Red Hat

Red Os

Suse

Ubuntu

References · 61

• https://osv.dev/vulnerability/BIT-openldap-2020-25710 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2020-25710 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2021:0128-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2021:0129-1 · Vendor Advisory
• https://osv.dev/vulnerability/DSA-4792-1 · Vendor Advisory
• https://wiki.astralinux.ru/astra-linux-se47-bulletin-2022-0114SE47 · Vendor Advisory
• https://osv.dev/vulnerability/OESA-2021-1244 · Vendor Advisory
• https://debian.org/security/2020/dsa-4792 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-25709 · Vendor Advisory
• https://safe-surf.ru/specialists/bulletins-nkcki/681777 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2020-25710 · Vendor Advisory
• https://git.openldap.org/openldap/openldap/-/commit/ab3915154e69920d480205b4bf5ccb2b391a0a1f#a2feb6ed0257c21c6672793ee2f94eaadc10c72c · Vendor Advisory
• https://osv.dev/vulnerability/USN-4634-2 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2020-25710 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2020-25710 · Vendor Advisory