CVE-2021-46823

Publication date 18 June 2022

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

python-ldap before 3.4.0 is vulnerable to a denial of service when ldap.schema is used for untrusted schema definitions, because of a regular expression denial of service (ReDoS) flaw in the LDAP schema parser. By sending crafted regex input, a remote authenticated attacker could exploit this vulnerability to cause a denial of service condition.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
python-ldap	22.04 LTS jammy	Fixed 3.2.0-4ubuntu7.1
	21.10 impish	Fixed 3.2.0-4ubuntu5.1
	20.04 LTS focal	Fixed 3.2.0-4ubuntu2.1
	18.04 LTS bionic	Fixed 3.0.0-1ubuntu0.2

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
python-ldap	Upstream: https://github.com/python-ldap/python-ldap/pull/444/commits/31dbb4b075b4710e3adac7ac998a02aaeb2c5d3d

Severity score breakdown

Parameter	Value
Base score	6.5 · Medium
Attack vector	Network
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

USN-5508-1
Python LDAP vulnerability
11 July 2022