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CVE-2024-38474: Apache HTTP Server weakness with encoded question marks in backreferences

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-07-01 · updated 2026-06-17
• Weakness: CWE-116

Description

Substitution encoding issue in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows attacker to execute scripts in directories permitted by the configuration but not directly reachable by any URL or source disclosure of scripts meant to only to be executed as CGI. Users are recommended to upgrade to version 2.4.60, which fixes this issue. Some RewriteRules that capture and substitute unsafely will now fail unless rewrite flag "UnsafeAllow3F" is specified.

Affected products

• Apache HTTP Server: from 2.4.0 before 2.4.60 — fixed in 2.4.60
• Clustered Data ONTAP: 9.0

How to fix

Upgrade to a fixed version: Apache HTTP Server 2.4.60. Check the vendor advisory for mitigations.

References

• https://httpd.apache.org/security/vulnerabilities_24.html
• https://security.netapp.com/advisory/ntap-20240712-0001/
• http://www.openwall.com/lists/oss-security/2024/07/01/7
• https://httpd.apache.org/security/vulnerabilities_24.html
• https://security.netapp.com/advisory/ntap-20240712-0001/

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