CVE-2025-61912Public exploitNetwork attack vector

Client-side denial of service via malformed NUL escaping

Published Oct 10, 2025 · Updated Oct 14, 2025

Improper NUL escaping in python-ldap before 3.4.5 allows remote attackers to interrupt client workflows through crafted DN input. The ldap.dn.escape_dn_chars() helper replaces U+0000 with a backslash and literal NUL rather than the RFC 4514 hexadecimal form, causing downstream API calls to reject the DN before network I/O. An application must pass attacker-controlled text into this helper; the resulting exception can crash a handler, stall retries, or jam a processing queue.

CVSS severityUnavailable
Unscored
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper NUL escaping in python-ldap before 3.4.5 allows remote attackers to interrupt client workflows through crafted DN input. The ldap.dn.escape_dn_chars() helper replaces U+0000 with a backslash and literal NUL rather than the RFC 4514 hexadecimal form, causing downstream API calls to reject the DN before network I/O. An application must pass attacker-controlled text into this helper; the resulting exception can crash a handler, stall retries, or jam a processing queue.

The record

CVE
CVE-2025-61912
Published
Oct 10, 2025
Updated
Oct 14, 2025
Vendor
python-ldap project
Product
python-ldap
Classifications
CWE-116, CWE-170, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 10, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 14, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.4.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

python-ldap project · python-ldapversion=< 3.4.5

Published CVSS scores

5.5GitHubCVSS: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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-116Improper Encoding or Escaping of Output
CWE-170Improper Null Termination
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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