CVE-2024-39573Public exploitNetwork attack vector

Server-side request forgery via proxy handler substitution

Published Jul 1, 2024 · Updated Nov 3, 2025

Server-side request forgery in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows remote attackers to reach unintended backends. mod_rewrite treats crafted RewriteRule substitutions as proxy targets and passes them to mod_proxy instead of retaining ordinary rewritten-path handling. Exposure requires mod_rewrite and mod_proxy with a rule that permits attacker-controlled input to influence the resulting target URL.

CVSS severity7.5
High
EPSS probability37.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side request forgery in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows remote attackers to reach unintended backends. mod_rewrite treats crafted RewriteRule substitutions as proxy targets and passes them to mod_proxy instead of retaining ordinary rewritten-path handling. Exposure requires mod_rewrite and mod_proxy with a rule that permits attacker-controlled input to influence the resulting target URL.

The record

CVE
CVE-2024-39573
Published
Jul 1, 2024
Updated
Nov 3, 2025
Vendor
The Apache Software Foundation
Product
Apache HTTP Server
Classifications
CWE-20, 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

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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

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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.

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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 exploitPublished

Weakness, pattern, technique

CWE-20Improper Input Validation
T1190Exploit Public-Facing Application

Public exploit references

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

Technologies

Your stack

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Your stack

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