CVE-2025-59775

Apache HTTP Server: NTLM Leakage on Windows through UNC SSRF

Published Dec 5, 2025 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Description
Server-Side Request Forgery (SSRF) vulnerability

 in Apache HTTP Server on Windows

with AllowEncodedSlashes On and MergeSlashes Off  allows to potentially leak NTLM
hashes to a malicious server via SSRF and malicious requests or content

Users are recommended to upgrade to version 2.4.66, which fixes the issue.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-4452-1 apache2 security update
History
Type Values Removed Values Added
CPEs cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
Type Values Removed Values Added
First Time appeared Apache
Apache http Server
Microsoft
Microsoft windows
Vendors & Products Apache
Apache http Server
Microsoft
Microsoft windows
Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description Server-Side Request Forgery (SSRF) vulnerability  in Apache HTTP Server on Windows with AllowEncodedSlashes On and MergeSlashes Off  allows to potentially leak NTLM hashes to a malicious server via SSRF and malicious requests or content Users are recommended to upgrade to version 2.4.66, which fixes the issue.
Title Apache HTTP Server: NTLM Leakage on Windows through UNC SSRF
Weaknesses CWE-918
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
apache
Published
Updated
Dec 5, 2025, 7:28 PM
Reserved
Sep 19, 2025, 12:13 PM
Status
Analyzed
Published
Dec 5, 2025, 11:15 AM
Modified
Sep 25, 2026, 11:10 PM
Severity
Important
Public date
Dec 5, 2025, 10:17 AM