CVE-2024-38475Known exploitationPublic exploitNetwork attack vector

Code execution via unsafe filesystem path substitution

Published Jul 1, 2024 · Updated Nov 3, 2025

Improper output escaping in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows remote attackers to execute code or disclose source files. Server-context RewriteRules treat a backreference or variable at the start of a substitution as a filesystem path without properly escaping the generated output. Exposure requires such a server-level substitution and a filesystem location that Apache permits but does not intentionally map to a URL.

CVSS severity9.1
Critical
EPSS probability99.96%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper output escaping in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows remote attackers to execute code or disclose source files. Server-context RewriteRules treat a backreference or variable at the start of a substitution as a filesystem path without properly escaping the generated output. Exposure requires such a server-level substitution and a filesystem location that Apache permits but does not intentionally map to a URL.

The record

CVE
CVE-2024-38475
Published
Jul 1, 2024
Updated
Nov 3, 2025
Vendor
The Apache Software Foundation
Product
Apache HTTP Server
Classifications
CWE-116, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 1, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.4.0 <=2.4.59

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache HTTP Serverversion=2.4.0 <=2.4.59
NetApp · ONTAPversion=0 <*

Published CVSS scores

9.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsShadowserver observations through Sep 15, 2026. Gaps indicate unavailable data.
Sep 9, 2026Sep 15, 2026
View daily counts
Reporting dayUnique IPs
Sep 9, 2026Unavailable
Sep 10, 2026Unavailable
Sep 11, 2026Unavailable
Sep 12, 2026Unavailable
Sep 13, 2026Unavailable
Sep 14, 20261
Sep 15, 2026Unavailable
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-116Improper Encoding or Escaping of Output
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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