CVE-2021-46823

Ubuntu Security Notice USN-5508-1

Severity Score

6.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

python-ldap versiones anteriores a 3.4.0, es vulnerable a una denegación de servicio cuando es usado ldap.schema para definiciones de esquemas que no son confiables, debido a un fallo de denegación de servicio de expresiones regulares (ReDoS) en el analizador de esquemas LDAP. Al enviar una entrada regex diseñada, un atacante remoto autenticado podría explotar esta vulnerabilidad para causar una condición de denegación de servicio

It was discovered that Python LDAP incorrectly handled certain regular expressions. An remote attacker could possibly use this issue to cause a denial of service.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

Single

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2022-06-18 CVE Reserved
2022-06-18 CVE Published
2024-08-04 CVE Updated
2025-04-14 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-1333: Inefficient Regular Expression Complexity

CAPEC

References (2)

URL	Tag	Source
https://exchange.xforce.ibmcloud.com/vulnerabilities/221507	Third Party Advisory
https://github.com/python-ldap/python-ldap/security/advisories/GHSA-r8wq-qrxc-hmcm	Third Party Advisory

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Python-ldap Search vendor "Python-ldap"		Python-ldap Search vendor "Python-ldap" for product "Python-ldap"				< 3.4.0 Search vendor "Python-ldap" for product "Python-ldap" and version " < 3.4.0"		-		Affected