CVE-2025-59775: Apache HTTP Server: NTLM Leakage on Windows through UNC SSRF

Published Dec 4, 2025
·
Updated

802.1X. An authentication issue was addressed with improved state management.

Other sources

Accounts. An authorization issue was addressed with improved state management.

— Apple

Admin Framework. A path handling issue was addressed with improved validation.

— Apple

Apache HTTP Server: NTLM Leakage on Windows through UNC SSRF

— Microsoft

apache. This is a vulnerability in open source code and Apple Software is among the affected projects. The CVE-ID was assigned by a third party. Learn more about the issue and CVE-ID at cve.org.

— Apple

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.

— MITRE

Credit

Rosyna Keller(Totally Not Malicious Software), Ryan Dowd@@_rdowd, CVE-2025-55753, CVE-2025-58098, CVE-2025-59775, CVE-2025-65082, CVE-2025-66200, Mickey Jin@@patch1t, an anonymous researcher, Koh M. Nakagawa@@tsunek0h(FFRI Security Inc), Talal Haj Bakry(Mysk Inc), Tommy Mysk@@mysk_co(Mysk Inc), Zhongquan Li@@Guluisacat, Justin Cohen(Google), Jex Amro, Cristian Dinca (icmd.tech), Hossein Lotfi@@hosselot(TrendAI Zero Day Initiative), YingQi Shi@@Mas0nShi(DBAppSecurity's WeBin lab), Mustafa Calap@@ordinal0, dbg.re), Etienne Charron (Renault), Victoria Martini (Renault), Zhongcheng Li(IES Red Team), Andreas Jaegersberger & Ro Achterberg(Nosebeard Labs), Asaf Cohen, CVE-2025-14524, 风沐云烟@@binary_fmyy, Minghao Lin@@Y1nKoc, Jonathan Bar Or@@yo_yo_yo_jbo, DARKNAVY@@DarkNavyOrg, XiguaSec, Ye Zhang(Baidu Security), Ryan Dowd@@_rdowd(Iru), Csaba Fitzl@@theevilbit(Iru), CVE-2025-64505, Joseph Ravichandran@@0xjprx(MIT CSAIL), Gor Aleksanyan(BoB 0xB6), Dhiyanesh Selvaraj@@redroot97(BoB 0xB6), 이동하 (Lee Dong Ha(BoB 0xB6), Jian Lee@@speedyfriend433, hari shanmugam, Johnny Franks@@0xjohnny, Yuebin Sun@@yuebinsun2020(SecuRing), an anonymous researcher(SecuRing), Nathaniel Oh@@calysteon(SecuRing), Kirin@@Pwnrin(SecuRing), Wojciech Regula(SecuRing), Joshua Jewett@@JoshJewett33, Ilya Andr (andrd3v)(RTU MIREA), Ilias Morad (A2nkF)(Voynich Group), Duy Trần@@khanhduytran0, @@hugeBlack, Himanshu Bharti@@Xpl0itme(Khatima), Rodolphe Brunetti@@eisw0lf(Lupus Nova), Matej Moravec@@MacejkoMoravec, Dawuge(Shuffle Team), Hunan University, Gergely Kalman@@gergely_kalman, Andrei Dodu, Morris Richman@@morrisinlife, Kun Peeks@@SwayZGl1tZyyy, Dave G., Gyujeong Jin at Team.0xb6@@G1uN4sh, wdszzml, Atuin Automated Vulnerability Discovery Engine, Alex Radocea, Christian Kohlschütter, Sreejith Krishnan R, @@pixiepointsec, Luke Roberts@@rookuu, Pedro Tôrres@@t0rr3sp3dr0, Caspian Tarafdar, Andrew Becker, webb, Thomas Espach, @@hamayanhamayan, Yeonghyeon Choi, Daniel Rhea, Söhnke Benedikt Fischedick (Tripton), Emrovsky & Switch3301, Yevhen Pervushyn, Minse Kim, Narcis Oliveras Fontàs, Nathaniel Oh@@calysteon, Hongze Wu(Ant Group Infrastructure Security Team), Shuaike Dong(Ant Group Infrastructure Security Team), greenbynox, Arni Hardarson, Gongyu Ma@@Mezone0, Héloïse Gollier, Mathy Vanhoef (KU Leuven), Johnny Franks (zeroxjf), Amy (amys.website), @@cloudlldb, Kirin@@Pwnrin, Chunyu Song(NorthSea)

Affected Software

7 affected componentsFixes available
Apache HTTP Server<2.4.66
Microsoft azl3 httpd 2.4.65-1
Microsoft cbl2 httpd 2.4.65-1
Apache HTTP Server>=2.4.0<2.4.66
Apple macOS Tahoe<26.4
26.4
Apple macOS Sequoia<15.7.5
15.7.5
Apple macOS Sonoma<14.8.5
14.8.5

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 26.4
  2. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 15.7.5
  3. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 14.8.5
  4. Upgrade

    Upgrade apache HTTP Server to a version that resolves this vulnerability.

    Fixed in 2.4.66Patch CVE-2025-59775
  5. Configuration

    Because the issue can allow NTLM leakage when 'AllowEncodedSlashes On' and 'MergeSlashes Off' are used together, review your Apache Windows configuration and set these options away from the vulnerable combination described as 'AllowEncodedSlashes On' with 'MergeSlashes Off'.

    Apache HTTP Server on Windows AllowEncodedSlashes = On

Event History

Dec 5, 2025
CVE Published
via MITRE·10:17 AM
Data Sourced
via MITRE·10:17 AM
DescriptionWeakness
Data Sourced
via NVD·11:15 AM
DescriptionSeverityWeaknessAffected Software
Dec 7, 2025
Data Sourced
via Microsoft·01:03 AM
DescriptionSeverityWeaknessAffected Software
Updated
via Microsoft·01:03 AM
Affected Software
Updated
via Microsoft·01:03 AM
DescriptionSeverity
Mar 24, 2026
Data Sourced
via Apple·12:00 AM
DescriptionWeaknessAffected Software
Updated
via Apple·12:00 AM
DescriptionWeakness
Updated
via Apple·12:00 AM
Affected Software
Updated
via Apple·12:00 AM
DescriptionWeaknessAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

1

What is the severity of CVE-2025-59775?

CVE-2025-59775 is classified as a high severity Server-Side Request Forgery (SSRF) vulnerability.

2

How do I fix CVE-2025-59775?

To fix CVE-2025-59775, upgrade your Apache HTTP Server to version 2.4.67 or later.

3

What versions of Apache HTTP Server are affected by CVE-2025-59775?

CVE-2025-59775 affects Apache HTTP Server versions up to 2.4.66.

4

What does the vulnerability CVE-2025-59775 allow an attacker to do?

CVE-2025-59775 allows an attacker to potentially leak NTLM hashes to a malicious server via exploited SSRF.

5

On which platform does CVE-2025-59775 occur?

CVE-2025-59775 occurs specifically on the Windows platform of Apache HTTP Server.

Company

Resources

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