Vulnerability in Python-Ldap
CVE-2025-61912
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.005 (37.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 37.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.000
Affected products
- Python-Ldap — versions < 3.4.5
Weakness classification (CWE)
References
- github.com/python-ldap/python-ldap/security/advisories/GHSA-p34h-wq7j-h5v6 (Exploit, Third Party Advisory)
- github.com/python-ldap/python-ldap/commit/6ea80326a34ee6093219628d7690bced50c49… (Patch)
- github.com/python-ldap/python-ldap/releases/tag/python-ldap-3.4.5 (Release Notes)
Frequently asked questions
- What is CVE-2025-61912?
- CVE-2025-61912 is a medium-severity vulnerability in Python-Ldap, classified under Improper Encoding or Escaping of Output. CVSS score: 5.3/10. Published 2025-10-10.
- How severe is CVE-2025-61912?
- Medium severity. CVSS v3 base score is 5.3 out of 10.