Vulnerability report

Exploited in the wild Confirmed confidence In CISA KEV

CVE-2024-38475

Apache HTTP Server

Apache HTTP Server · 2.4.0 to <= 2.4.59

Watch CVE-2024-38475 Browse KEV feed
Severity
CVSS 9.1 · Critical
Confidence
Confirmed
Exploit status
Exploited in the wild
EPSS
100.0%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2024-38475 is an unauthenticated vulnerability affecting Apache HTTP Server. Improper escaping of output in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows an attacker to map URLs to filesystem...

Is it exploited?

Yes. Previdian tracks this CVE as a known exploited vulnerability. Confidence is confirmed. Listed in CISA KEV. Also confirmed by third-party sources.

Who is affected?

Apache HTTP Server 2.4.0 to <= 2.4.59.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

Apache HTTP Server

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.

apache Affected
http_server
Through 2.4.59
netapp Affected
ontap_9
Before *
Apache Software Foundation Affected
Apache HTTP Server
Through 2.4.59
View vendor advisory (opens in new tab)
Published
01 Jul 2024
Exploitation Reported
01 May 2025
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

Tags

cisa apache nuclei_scanner

CVE References

Exploitation evidence

Why Previdian marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CISA

Recorded 01 May 2025

A trusted third party reported exploitation.

Proof of concept available

GitHub

Recorded 18 Aug 2024

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

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Source Added
CISA First 2025-05-01 00:00 UTC
The Shadowserver 2026-06-02 00:00 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
User-Agents
Callback hosts
0
0
0

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

Scanner Artifacts

Scanner and exploit-framework references linked to this CVE.

Scanner Reference Detected
Nuclei https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2024/CVE-2024-38475.yaml 16 May 2025

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

9.1 Critical

Potential damage if exploited. Separate from whether attackers are using it.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS

100.0%

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

Improper Encoding or Escaping of Output CWE-116

Recent mention · watchTowr

SonicBoom, From Stolen Tokens to Remote Shells - SonicWall SMA (CVE-2023-44221, CVE-2024-38475)

Another day, another edge device being targeted - it’s a typical Thursday!In today’s blog post, we’re excited to share our previously private analysis of the now exploited in-the-wild N-day vulnerabilities affecting SonicWall’s SMA100 appliance. Over the last few months, our...

Read full advisory

All Mentions

Recent mention · watchTowr

SonicBoom, From Stolen Tokens to Remote Shells - SonicWall SMA (CVE-2023-44221, CVE-2024-38475)

watchTowr · 01 May 2025

Another day, another edge device being targeted - it’s a typical Thursday!In today’s blog post, we’re excited to share our previously private analysis of the now exploited in-the-wild N-day vulnerabilities affecting SonicWall’s SMA100 appliance. Over the last few months, our client

Recent mention · All CISA Advisories

CISA Adds Two Known Exploited Vulnerabilities to Catalog

All CISA Advisories · 01 May 2025

CISA has added two new vulnerabilities to its Known Exploited Vulnerabilities Catalog, based on evidence of active exploitation. CVE-2024-38475 Apache HTTP Server Improper Escaping of Output Vulnerability CVE-2023-44221 SonicWall SMA100 Appliances OS Command Injection Vulnerability These types of vulnerabilities are frequent attack vectors for malicious cyber actors and pose significant risks to the federal enterprise. Binding Operational Directive (BOD) 22-01: Reducing the Significant Risk of Known Exploited Vulnerabilities established the Known Exploited Vulnerabilities Catalog as a...

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

Sonicwall - Pre-Authentication Arbitrary File Read

nuclei · Created Unknown

Timeline

From disclosure to observed exploitation

  1. 14:20 UTC

    Public PoC available

    Public proof-of-concept code published

  2. 00:00 UTC

    KEV confirmed by The Shadowserver

    Exploitation attested by an external source

  3. 08:44 UTC

    Nuclei template available

    Scanner coverage available

  4. 00:00 UTC

    Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  5. 18:15 UTC

    CVE published

    Vulnerability disclosed publicly

  6. 11:09 UTC

    CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2024-38475

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2024-38475",
  "confidence": "Confirmed",
  "cvss_score": 9.1,
  "cvss_estimated": false,
  "epss_score": 0.99957,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}