VulnerabilityAnalyzed

CVE-2025-61912

Any application that uses this helper to construct DNs from untrusted input can be made to consistently fail before a request is sent to the LDAP server (e.g., AD), resulting in a client-side denial of service.

MEDIUM 5.5EPSS 0.46%

Does this matter?

Lower severity and a low EPSS score (0.46%). Track it; it rarely justifies an emergency change on its own.

Description

python-ldap is a lightweight directory access protocol (LDAP) client API for Python. In versions prior to 3.4.5, ldap.dn.escape_dn_chars() escapes \x00 incorrectly by emitting a backslash followed by a literal NUL byte instead of the RFC-4514 hex form \00. Any application that uses this helper to construct DNs from untrusted input can be made to consistently fail before a request is sent to the LDAP server (e.g., AD), resulting in a client-side denial of service. Version 3.4.5 contains a patch for the issue.

CVSS 4.0: 5.5 MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
EPSS: 0.46% probability · 39th percentile
CISA KEV: Not listed
Weakness: CWE-116, CWE-170
Affected: python-ldap/python-ldap
Source: security-advisories@github.com

References

https://github.com/python-ldap/python-ldap/commit/6ea80326a34ee6093219628d7690bced50c49a3fPatch
https://github.com/python-ldap/python-ldap/releases/tag/python-ldap-3.4.5Release Notes
https://github.com/python-ldap/python-ldap/security/advisories/GHSA-p34h-wq7j-h5v6Exploit, Third Party Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.