CVE-2024-38475 (GCVE-0-2024-38475)

Vulnerability from cvelistv5 – Published: 2024-07-01 18:15 – Updated: 2025-11-03 21:55
VLAI CISA KEV
Title
Apache HTTP Server weakness in mod_rewrite when first segment of substitution matches filesystem path.
Summary
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.
Severity
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
SSVC
Exploitation: active Automatable: yes Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-116 - Improper Encoding or Escaping of Output
Assigner
References
Impacted products
Vendor Product Version
Apache Software Foundation Apache HTTP Server Affected: 2.4.0 , ≤ 2.4.59 (semver)
Create a notification for this product.
apache http_server Affected: 2.4.0 , ≤ 2.4.59 (custom)
    cpe:2.3:a:apache:http_server:2.4.0:*:*:*:*:*:*:*
 Create a notification for this product.
netapp ontap_9 Affected: 0 , < * (custom)
    cpe:2.3:a:netapp:ontap_9:-:*:*:*:*:*:*:*
 Create a notification for this product.
Credits
Orange Tsai (@orange_8361) from DEVCORE
CISA KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: c1665875-99b7-4cf5-8a06-894671c3ad91

Vulnerability ID: CVE-2024-38475

Status: Confirmed

Status Updated: 2025-05-01 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2025-05-01
Asserted: 2025-05-01
Scope
Notes: KEV entry: Apache HTTP Server Improper Escaping of Output Vulnerability | Affected: Apache / HTTP Server | Description: Apache HTTP Server contains an improper escaping of output vulnerability in mod_rewrite that 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. | 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. | Due date: 2025-05-22 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): This vulnerability affects a common open-source component, third-party library, or a protocol used by different products. Please check with specific vendors for information on patching status. For more information, please see: https://httpd.apache.org/security/vulnerabilities_24.html ; https://nvd.nist.gov/vuln/detail/CVE-2024-38475
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-116
Feed CISA Known Exploited Vulnerabilities Catalog
Product HTTP Server
Due Date 2025-05-22
Date Added 2025-05-01
Vendorproject Apache
Vulnerabilityname Apache HTTP Server Improper Escaping of Output Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-02-02 13:24 UTC | Updated: 2026-02-06 07:53 UTC
Show details on NVD website
To clipboard 

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in\u0026nbsp;server context that use a backreferences or variables as the first segment of the substitution are affected.\u0026nbsp; 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.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-116\", \"description\": \"CWE-116 Improper Encoding or Escaping of Output\"}]}], \"providerMetadata\": {\"orgId\": \"f0158376-9dc2-43b6-827c-5f631a4d8d09\", \"shortName\": \"apache\", \"dateUpdated\": \"2024-07-12T14:06:09.772Z\"}}}",
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}


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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.