CVE-2024-38475
Apache Software Foundation Apache HTTP Server, apache http_server, netapp ontap_9
Published 1 Jul 2024 · updated 17 Jun 2026 · Analyzed
Exploited in the wild
CISA added this to its Known Exploited Vulnerabilities catalog on 1 May 2025, with a remediation deadline of 22 May 2025 for US federal agencies.
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
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.
References
- httpd.apache.org/security/vulnerabilities_24.html · Vendor Advisory
- security.netapp.com/advisory/ntap-20240712-0001/ · Third Party Advisory
- www.openwall.com/lists/oss-security/2024/07/01/8 · Third Party Advisory
- github.com/apache/httpd/commit/9a6157d1e2f7ab15963020381054b48782bc18cf · Patch
- psirt.global.sonicwall.com/vuln-detail/SNWLID-2024-0018 · Third Party Advisory
- www.blackhat.com/us-24/briefings/schedule/index.html#confusion-attacks-exploiting-hidden-semantic-ambiguity-in-apache-http-server-pre-recorded-40227 · Third Party Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-38475 · Third Party Advisory, US Government Resource