CVE-2024-38474Network attack vector

Remote script execution via encoded question-mark substitution

Published Jul 1, 2024 · Updated Mar 25, 2025

Substitution encoding in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows remote attackers to execute scripts or disclose source. mod_rewrite decodes an encoded %3F before matching, then reinserts the captured question mark into a substitution where it becomes the path-query delimiter. Exposure requires a RewriteRule that captures and unsafely substitutes attacker-controlled URL data, permitting access to configured script directories that no direct URL reaches.

CVSS severity7.4
High
EPSS probability2.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Substitution encoding in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows remote attackers to execute scripts or disclose source. mod_rewrite decodes an encoded %3F before matching, then reinserts the captured question mark into a substitution where it becomes the path-query delimiter. Exposure requires a RewriteRule that captures and unsafely substitutes attacker-controlled URL data, permitting access to configured script directories that no direct URL reaches.

The record

CVE
CVE-2024-38474
Published
Jul 1, 2024
Updated
Mar 25, 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. Mar 25, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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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

Published CVSS scores

7.4Amazon LinuxCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
8.1Oracle LinuxCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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