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CVE-2024-43394

Apache HTTP Server: SSRF on Windows due to UNC paths

7.5 HighFix available

Server-Side Request Forgery (SSRF) in Apache HTTP Server on Windows allows to potentially leak NTLM hashes to a malicious server via  mod_rewrite or apache expressions that pass unvalidated request input.

This issue affects Apache HTTP Server: from 2.4.0 through 2.4.63.

Note:  The Apache HTTP Server Project will be setting a higher bar for accepting vulnerability reports regarding SSRF via UNC paths.

The server offers limited protection against administrators directing the server to open UNC paths. Windows servers should limit the hosts they will connect over via SMB based on the nature of NTLM authentication.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
None
Availability
None

Exploit likelihood

1.27%Up 1.2 points since Jul 11, 2025
90%50%10%1%

What each source reports

CVE List Score used 7.5

Apache HTTP Server: SSRF on Windows due to UNC paths

Server-Side Request Forgery (SSRF) in Apache HTTP Server on Windows allows to potentially leak NTLM hashes to a malicious server via  mod_rewrite or apache expressions that pass unvalidated request input.

This issue affects Apache HTTP Server: from 2.4.0 through 2.4.63.

Note:  The Apache HTTP Server Project will be setting a higher bar for accepting vulnerability reports regarding SSRF via UNC paths.

The server offers limited protection against administrators directing the server to open UNC paths. Windows servers should limit the hosts they will connect over via SMB based on the nature of NTLM authentication.

Record
CVE-2024-43394
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-918
Updated
2026-11-02
EUVDEUVD-2024-54772 7.5

Server-Side Request Forgery (SSRF) in Apache HTTP Server on Windows allows to potentially leak NTLM hashes to a malicious server via  mod_rewrite or apache expressions that pass unvalidated request input.

This issue affects Apache HTTP Server: from 2.4.0 through 2.4.63.

Note:  The Apache HTTP Server Project will be setting a higher bar for accepting vulnerability reports regarding SSRF via UNC paths.

The server offers limited protection against administrators directing the server to open UNC paths. Windows servers should limit the hosts they will connect over via SMB based on the nature of NTLM authentication.

Record
EUVD-2024-54772
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-gxxm-rhpx-j39m 7.5

Server-Side Request Forgery (SSRF) in Apache HTTP Server on Windows allows to potentially leak...

Server-Side Request Forgery (SSRF) in Apache HTTP Server on Windows allows to potentially leak NTLM hashes to a malicious server via  mod_rewrite or apache expressions that pass unvalidated request input.

This issue affects Apache HTTP Server: from 2.4.0 through 2.4.63.

Note:  The Apache HTTP Server Project will be setting a higher bar for accepting vulnerability reports regarding SSRF via UNC paths.

The server offers limited protection against administrators directing the server to open UNC paths. Windows servers should limit the hosts they will connect over via SMB based on the nature of NTLM authentication.

Record
GHSA-gxxm-rhpx-j39m
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-918
Updated
2026-11-02
NVD 7.5

Server-Side Request Forgery (SSRF) in Apache HTTP Server on Windows allows to potentially leak NTLM hashes to a malicious server via  mod_rewrite or apache expressions that pass unvalidated request input.

This issue affects Apache HTTP Server: from 2.4.0 through 2.4.63.

Note:  The Apache HTTP Server Project will be setting a higher bar for accepting vulnerability reports regarding SSRF via UNC paths.

The server offers limited protection against administrators directing the server to open UNC paths. Windows servers should limit the hosts they will connect over via SMB based on the nature of NTLM authentication.

Record
CVE-2024-43394
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-918
Updated
2026-11-02
OSVALPINE-CVE-2024-43394 7.5

Server-Side Request Forgery (SSRF) in Apache HTTP Server on Windows allows to potentially leak NTLM hashes to a malicious server via  mod_rewrite or apache expressions that pass unvalidated request input.

This issue affects Apache HTTP Server: from 2.4.0 through 2.4.63.

Note:  The Apache HTTP Server Project will be setting a higher bar for accepting vulnerability reports regarding SSRF via UNC paths.

The server offers limited protection against administrators directing the server to open UNC paths. Windows servers should limit the hosts they will connect over via SMB based on the nature of NTLM authentication.

Record
ALPINE-CVE-2024-43394
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
OSVBELL-CVE-2024-43394 7.5
Record
BELL-CVE-2024-43394
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
Show 6 moreShow less
OSV 7.5

Apache HTTP Server: SSRF on Windows due to UNC paths

Server-Side Request Forgery (SSRF) in Apache HTTP Server on Windows allows to potentially leak NTLM hashes to a malicious server via  mod_rewrite or apache expressions that pass unvalidated request input.

This issue affects Apache HTTP Server: from 2.4.0 through 2.4.63.

Note:  The Apache HTTP Server Project will be setting a higher bar for accepting vulnerability reports regarding SSRF via UNC paths.

The server offers limited protection against administrators directing the server to open UNC paths. Windows servers should limit the hosts they will connect over via SMB based on the nature of NTLM authentication.

Record
CVE-2024-43394
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-918
Updated
2026-11-02
OSVDEBIAN-CVE-2024-43394 7.5

Server-Side Request Forgery (SSRF) in Apache HTTP Server on Windows allows to potentially leak NTLM hashes to a malicious server via  mod_rewrite or apache expressions that pass unvalidated request input. This issue affects Apache HTTP Server: from 2.4.0 through 2.4.63. Note:  The Apache HTTP Server Project will be setting a higher bar for accepting vulnerability reports regarding SSRF via UNC paths. The server offers limited protection against administrators directing the server to open UNC paths. Windows servers should limit the hosts they will connect over via SMB based on the nature of NTLM authentication.

Record
DEBIAN-CVE-2024-43394
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
OSVBIT-apache-2024-43394 No score

Apache HTTP Server: SSRF on Windows due to UNC paths

Server-Side Request Forgery (SSRF) in Apache HTTP Server on Windows allows to potentially leak NTLM hashes to a malicious server via  mod_rewrite or apache expressions that pass unvalidated request input.

This issue affects Apache HTTP Server: from 2.4.0 through 2.4.63.

Note:  The Apache HTTP Server Project will be setting a higher bar for accepting vulnerability reports regarding SSRF via UNC paths.

The server offers limited protection against administrators directing the server to open UNC paths. Windows servers should limit the hosts they will connect over via SMB based on the nature of NTLM authentication.

Record
BIT-apache-2024-43394
Updated
2026-11-02
OSVCLSA-2026-1777946314 No score

httpd: Fix of 4 CVEs

  • CVE-2024-42516: fix HTTP response splitting in core via Content-Type response header (header_filter rewrite)
  • CVE-2024-43204: prevent SSRF via mod_headers RequestHeader set/edit Content-Type modifying response headers
  • CVE-2024-43394: expand UNC path checking with new ap_stat_check helper (Linux: defense-in-depth no-op); fold in upstream fix for CVE-2025-54090 (RewriteCond expr always evaluating true regression)
Record
CLSA-2026-1777946314
Updated
2026-11-02
OSVopenSUSE-SU-2025:15360-1 No score

apache2-2.4.64-1.1 on GA media

These are all security issues fixed in the apache2-2.4.64-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2025:15360-1
Updated
2026-11-02
OSVUBUNTU-CVE-2024-43394 No score

Server-Side Request Forgery (SSRF) in Apache HTTP Server on Windows allows to potentially leak NTLM hashes to a malicious server via mod_rewrite or apache expressions that pass unvalidated request input. This issue affects Apache HTTP Server: from 2.4.0 through 2.4.63. Note:  The Apache HTTP Server Project will be setting a higher bar for accepting vulnerability reports regarding SSRF via UNC paths. The server offers limited protection against administrators directing the server to open UNC paths. Windows servers should limit the hosts they will connect over via SMB based on the nature of NTLM authentication.

Record
UBUNTU-CVE-2024-43394
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
apache2
Alpine:v3.19
 before 2.4.64-r0
2.4.64-r0
apache2
Alpine:v3.20
 before 2.4.64-r0
2.4.64-r0
apache2
Alpine:v3.21
 before 2.4.64-r0
2.4.64-r0
apache2
Alpine:v3.22
 before 2.4.64-r0
2.4.64-r0
apache2
Alpine:v3.23
 before 2.4.64-r0
2.4.64-r0
apache2
Alpine:v3.24
 before 2.4.64-r0
2.4.64-r0
apache2
Alpaquita:23
 2.4.54-r2 up to 2.4.64-r0
2.4.64-r0
apache2
Alpaquita:25
 2.4.63-r0 up to 2.4.65-r0
2.4.65-r0
apache2
Alpaquita:stream
 2.4.56-r0 up to 2.4.64-r0
2.4.64-r0
apache
Bitnami
 2.4.0 up to 2.4.64
2.4.64
Show 14 moreShow less
Affected packages
PackageAffectedFixed
httpd
TuxCare:AlmaLinux:9.6
From an advisory covering 4 CVEs
 before 2.4.62-4.el9_6.4.tuxcare.els3
2.4.62-4.el9_6.4.tuxcare.els3
httpd-core
TuxCare:AlmaLinux:9.6
From an advisory covering 4 CVEs
 before 2.4.62-4.el9_6.4.tuxcare.els3
2.4.62-4.el9_6.4.tuxcare.els3
httpd-devel
TuxCare:AlmaLinux:9.6
From an advisory covering 4 CVEs
 before 2.4.62-4.el9_6.4.tuxcare.els3
2.4.62-4.el9_6.4.tuxcare.els3
httpd-filesystem
TuxCare:AlmaLinux:9.6
From an advisory covering 4 CVEs
 before 2.4.62-4.el9_6.4.tuxcare.els3
2.4.62-4.el9_6.4.tuxcare.els3
httpd-manual
TuxCare:AlmaLinux:9.6
From an advisory covering 4 CVEs
 before 2.4.62-4.el9_6.4.tuxcare.els3
2.4.62-4.el9_6.4.tuxcare.els3
httpd-tools
TuxCare:AlmaLinux:9.6
From an advisory covering 4 CVEs
 before 2.4.62-4.el9_6.4.tuxcare.els3
2.4.62-4.el9_6.4.tuxcare.els3
mod_ldap
TuxCare:AlmaLinux:9.6
From an advisory covering 4 CVEs
 before 2.4.62-4.el9_6.4.tuxcare.els3
2.4.62-4.el9_6.4.tuxcare.els3
mod_lua
TuxCare:AlmaLinux:9.6
From an advisory covering 4 CVEs
 before 2.4.62-4.el9_6.4.tuxcare.els3
2.4.62-4.el9_6.4.tuxcare.els3
mod_proxy_html
TuxCare:AlmaLinux:9.6
From an advisory covering 4 CVEs
 before 1:2.4.62-4.el9_6.4.tuxcare.els3
1:2.4.62-4.el9_6.4.tuxcare.els3
mod_session
TuxCare:AlmaLinux:9.6
From an advisory covering 4 CVEs
 before 2.4.62-4.el9_6.4.tuxcare.els3
2.4.62-4.el9_6.4.tuxcare.els3
mod_ssl
TuxCare:AlmaLinux:9.6
From an advisory covering 4 CVEs
 before 1:2.4.62-4.el9_6.4.tuxcare.els3
1:2.4.62-4.el9_6.4.tuxcare.els3
apache2
Debian:11
 before 2.4.65-1~deb11u1, plus listed versions
2.4.48-3.12.4.48-3.1+deb11u12.4.48-42.4.49-12.4.49-1~bpo10+1
Show 45 moreShow less
2.4.49-1~deb11u12.4.49-1~deb11u22.4.49-1~deb11u32.4.49-22.4.49-32.4.49-42.4.50-12.4.50-1~deb11u12.4.51-12.4.51-1~bpo10+12.4.51-1~bpo10+22.4.51-1~deb11u12.4.51-22.4.52-12.4.52-1~bpo10+12.4.52-1~deb11u12.4.52-1~deb11u22.4.52-22.4.52-32.4.53-12.4.53-1~deb11u12.4.53-22.4.53-2~bpo10+12.4.54-12.4.54-1~deb11u12.4.54-22.4.54-32.4.54-42.4.54-52.4.55-12.4.56-12.4.56-1~deb11u12.4.56-1~deb11u22.4.56-22.4.57-12.4.57-22.4.57-32.4.58-12.4.59-12.4.59-1~deb10u12.4.59-1~deb11u12.4.59-1~deb12u12.4.59-22.4.60-12.4.61-1
2.4.65-1~deb11u1
apache2
Debian:11
From an advisory covering 8 CVEs
 before 2.4.65-1~deb11u1, plus listed versions
2.4.48-3.12.4.48-3.1+deb11u12.4.48-42.4.49-12.4.49-1~bpo10+1
Show 45 moreShow less
2.4.49-1~deb11u12.4.49-1~deb11u22.4.49-1~deb11u32.4.49-22.4.49-32.4.49-42.4.50-12.4.50-1~deb11u12.4.51-12.4.51-1~bpo10+12.4.51-1~bpo10+22.4.51-1~deb11u12.4.51-22.4.52-12.4.52-1~bpo10+12.4.52-1~deb11u12.4.52-1~deb11u22.4.52-22.4.52-32.4.53-12.4.53-1~deb11u12.4.53-22.4.53-2~bpo10+12.4.54-12.4.54-1~deb11u12.4.54-22.4.54-32.4.54-42.4.54-52.4.55-12.4.56-12.4.56-1~deb11u12.4.56-1~deb11u22.4.56-22.4.57-12.4.57-22.4.57-32.4.58-12.4.59-12.4.59-1~deb10u12.4.59-1~deb11u12.4.59-1~deb12u12.4.59-22.4.60-12.4.61-1
2.4.65-1~deb11u1
apache2
openSUSE:Tumbleweed
From an advisory covering 8 CVEs
 before 2.4.64-1.1
2.4.64-1.1

History

History
RecordedChangedSources
affected, facts
affected
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2024-43394 is a high vulnerability (CVSS 7.5) in Apache Http Server, published July 10, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.27%, the 70th percentile. Fixed in apache2 2.4.64-r0.

References

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Left out here: 28 versions. The JSON record has them.

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