CVE-2024-38475
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…
Browse: All 2024 CVEs · All vendors
- CVSS score
- 9.1 Critical
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N- CISA KEV
- Yes — actively exploited (added 2025-05-01, remediation due 2025-05-22)
- Weakness (CWE)
- CWE-116
- Published
- 2024-07-01
- Last modified
- 2026-06-17
- NVD status
- Analyzed
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.
Affected products
- apache http server
- netapp ontap 9
- sonicwall sma 200 firmware
- sonicwall sma 210 firmware
- sonicwall sma 400 firmware
- sonicwall sma 410 firmware
- sonicwall sma 500v firmware
Affected ranges per NVD CPE data; confirm exact versions in the vendor advisory.
Required action (CISA)
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Federal remediation deadline: 2025-05-22.
How to prioritize this
This vulnerability is on the CISA KEV list, meaning it is being actively exploited — treat it as urgent regardless of the raw CVSS number. Use the live CVE lookup for the latest NVD data, and the CVSS 3.1 calculator to model your own environmental score.
References
- https://httpd.apache.org/security/vulnerabilities_24.html
- https://security.netapp.com/advisory/ntap-20240712-0001/
- http://www.openwall.com/lists/oss-security/2024/07/01/8
- https://github.com/apache/httpd/commit/9a6157d1e2f7ab15963020381054b48782bc18cf
- https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2024-0018
- https://www.blackhat.com/us-24/briefings/schedule/index.html#confusion-attacks-exploiting-hidden-semantic-ambiguity-in-apache-http-server-pre-recorded-40227
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-38475
FAQ
Is CVE-2024-38475 actively exploited?
Yes. CISA added CVE-2024-38475 to its Known Exploited Vulnerabilities (KEV) catalog on 2025-05-01, with a federal remediation deadline of 2025-05-22. A KEV listing means real-world exploitation is confirmed, so patching this should be prioritized above many higher-CVSS bugs that aren't being exploited.
What is the CVSS score of CVE-2024-38475?
CVE-2024-38475 has a CVSS base score of 9.1 (Critical). Its vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.
Related vulnerabilities
- CVE-2021-42013 — Apache HTTP Server
- CVE-2021-41773 — Apache HTTP Server
- CVE-2019-0211 — Apache HTTP Server
- CVE-2026-34486 — Apache Tomcat
- CVE-2026-34197 — Apache ActiveMQ
- CVE-2025-24813 — Apache Tomcat
Data source: NVD & CISA KEV. Shown as-is; nothing added. Last generated from NVD data — re-check the live tool for updates.
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