CVE-2024-38475 (GCVE-0-2024-38475)
Vulnerability from cvelistv5 – Published: 2024-07-01 18:15 – Updated: 2025-11-03 21:55Title
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)
SSVC
Exploitation: active
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-05-02 03:55 UTC
CWE
- CWE-116 - Improper Encoding or Escaping of Output
Assigner
References
7 references
Impacted products
3 products
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache HTTP Server |
Affected:
2.4.0 , ≤ 2.4.59
(semver)
|
|
| apache | http_server |
Affected:
2.4.0 , ≤ 2.4.59
(custom)
cpe:2.3:a:apache:http_server:2.4.0:*:*:*:*:*:*:* |
|
| netapp | ontap_9 |
Affected:
0 , < *
(custom)
cpe:2.3:a:netapp:ontap_9:-:*:*:*:*:*:*:* |
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 31dfc173-facd-4856-8078-6a0c30b5c42c
Exploited: Yes
Timestamps
First Seen: 2025-05-01
Asserted: 2025-05-01
Scope
Notes: 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: 2026-10-02 08:09 CEST
| Updated: 2026-10-02 08:09 CEST
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: c0797702-ca08-45a9-a8bc-318496f58405
Exploited: Yes
Timestamps
First Seen: 2025-05-01
Asserted: 2025-05-01
Scope
Notes: Apache HTTP Server weakness in mod_rewrite when first segment of substitution matches filesystem path. | Affected: Apache / Apache HTTP Server | CVSS: 9.1 (CRITICAL) | EPSS: 0.99957 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence
Type: Public Report
Signal: Successful Exploitation
Confidence: 70%
Source: previdian
Details
| Feed | Previdian (previdian.com) |
|---|---|
| Title | Apache HTTP Server weakness in mod_rewrite when first segment of substitution matches filesystem path. |
| Cve Id | CVE-2024-38475 |
| Vendor | Apache |
| Ghsa Id | None |
| Product | Apache HTTP Server |
| Added Date | 2025-05-01T00:00:00.000Z |
| Cvss Score | 9.1 |
| Epss Score | 0.99957 |
| Previous Ids | |
| Cvss Severity | CRITICAL |
| Virtual Patch | False |
| Cvss Estimated | False |
| Epss Percentile | 0.99975 |
| Used In Malware | unknown |
| Vulnerability Id | CVE-2024-38475 |
| Ahead Of Cisa Kev | None |
| Not Yet In Cisa Kev | False |
References
Created: 2026-10-02 09:10 CEST
| Updated: 2026-10-02 09:10 CEST
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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