CVE-2024-43394Network attack vector

NTLM hash disclosure via unvalidated UNC paths

Published Jul 10, 2025 · Updated Nov 4, 2025

SSRF in Apache HTTP Server 2.4.0 through 2.4.63 on Windows allows remote attackers to disclose NTLM hashes via crafted requests. mod_rewrite and Apache expressions pass unvalidated request input into UNC paths, causing Windows to initiate SMB authentication to an attacker-controlled server. Exposure requires a configuration that incorporates request data into those path-producing directives; the demonstrated consequence is outbound NTLM hash disclosure.

CVSS severity7.5
High
EPSS probability1.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Apache HTTP Server 2.4.0 through 2.4.63 on Windows allows remote attackers to disclose NTLM hashes via crafted requests. mod_rewrite and Apache expressions pass unvalidated request input into UNC paths, causing Windows to initiate SMB authentication to an attacker-controlled server. Exposure requires a configuration that incorporates request data into those path-producing directives; the demonstrated consequence is outbound NTLM hash disclosure.

The record

CVE
CVE-2024-43394
Published
Jul 10, 2025
Updated
Nov 4, 2025
Vendor
The Apache Software Foundation
Product
Apache HTTP Server
Classifications
CWE-918, CAPEC-664, T1190, T1187
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 10, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 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=2.4.0 <=2.4.63

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache HTTP Serverversion=2.4.0 <=2.4.63

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
CAPEC-664Server Side Request Forgery
T1190Exploit Public-Facing Application
T1187Forced Authentication

Public exploit references

No public exploit references are available in this record.

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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