CVE-2024-38475

Name: CVE-2024-38475
Creator: NVD / NIST
Published: 2024-07-01T19:15:04.883+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10Actively ExploitedEPSS 99.96%

Last modified Jun 17, 2026

CVE-2024-38475 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. Improper escaping of output in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows an attacker to map URLs to filesystem locations that are permitted to be served by the server but are not intentionally/directly reachable by any URL, resulting in code execution or source code disclosure. Substitutions in server context that use a backreferences or variables as the first segment of the substitution are affected. Some unsafe RewiteRules will be broken by this change and the rewrite flag "UnsafePrefixStat" can be used to opt back in once ensuring the substitution is appropriately constrained.. CISA has confirmed active exploitation in the wild. EPSS estimates a 99.96% chance of exploitation in the next 30 days.

Description

Improper escaping of output in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows an attacker to map URLs to filesystem locations that are permitted to be served by the server but are not intentionally/directly reachable by any URL, resulting in code execution or source code disclosure. Substitutions in server context that use a backreferences or variables as the first segment of the substitution are affected. Some unsafe RewiteRules will be broken by this change and the rewrite flag "UnsafePrefixStat" can be used to opt back in once ensuring the substitution is appropriately constrained.

Metrics

CVSS 3.1

9.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS Probability

99.96%

100.0th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by May 22, 2025.

Weakness Enumeration

CWE-116

Affected Software

Vendor	Product	Versions
Apache	Http Server	>= 2.4.0, < 2.4.60
Netapp	Ontap 9	All versions
Sonicwall	Sma 200 Firmware	< 10.2.1.14-75sv
Sonicwall	Sma 210 Firmware	< 10.2.1.14-75sv
Sonicwall	Sma 400 Firmware	< 10.2.1.14-75sv
Sonicwall	Sma 410 Firmware	< 10.2.1.14-75sv
Sonicwall	Sma 500v Firmware	< 10.2.1.14-75sv

References

https://httpd.apache.org/security/vulnerabilities_24.htmlVendor Advisory
https://security.netapp.com/advisory/ntap-20240712-0001/Third Party Advisory
http://www.openwall.com/lists/oss-security/2024/07/01/8Third Party Advisory
https://github.com/apache/httpd/commit/9a6157d1e2f7ab15963020381054b48782bc18cfPatch
https://httpd.apache.org/security/vulnerabilities_24.htmlVendor Advisory
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2024-0018Third Party Advisory
https://security.netapp.com/advisory/ntap-20240712-0001/Third Party Advisory
https://www.blackhat.com/us-24/briefings/schedule/index.html#confusion-attacks-exploiting-hidden-semantic-ambiguity-in-apache-http-server-pre-recorded-40227Third Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-38475Third Party Advisory, US Government Resource

Timeline

Published: Jul 1, 2024
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2024-38475?

How severe is CVE-2024-38475?

CVE-2024-38475 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 99.96% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2024-38475?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2024-38475?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST