What it is
CVE-2024-38475 is an unauthenticated vulnerability affecting Apache Software Foundation Apache HTTP Server. Improper escaping of output in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows an attacker to map...
Vulnerability report
Exploited in the wild
Confirmed confidence
In CISA KEV
CVE-2024-38475
Apache HTTP Server
Apache Software Foundation / Apache HTTP Server · 2.4.0 to <= 2.4.59
- 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.
Is it exploited?
Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is confirmed.
Who is affected?
Apache Software Foundation / 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.
Vendor
Product
Affected
Status
apache
http_server
Through 2.4.59
Affected
netapp
ontap_9
Before *
Affected
Apache Software Foundation
Apache HTTP Server
Through 2.4.59
Affected
- 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
- CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2024-38475
- Vendor Advisory — httpd.apache.org httpd.apache.org · Vendor Advisory https://httpd.apache.org/security/vulnerabilities_24.html
- security.netapp.com/advisory/ntap-20240712-0001 security.netapp.com · CVE Record https://security.netapp.com/advisory/ntap-20240712-0001/
Exploitation evidence
Why KEV Intelligence 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
Independent exploitation attestation added to the KEV Intelligence record.
Proof of concept available
GitHub
Public scanner or PoC coverage increases practical exploitability.
Known exploited vulnerability sources
Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.
Learn about Pro API access| 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
- 0
- User-Agents
- 0
Raw values available in Pro and Enterprise.
Scanner coverage
Nuclei template detected 16 May 2025.
View Nuclei template (opens in new tab)Virtual patch status
No KEV Intelligence 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
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS
100.0%
Recent mention · Watchtower Labs
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 advisoryAll Mentions
Recent mention · Watchtower Labs
SonicBoom, From Stolen Tokens to Remote Shells - SonicWall SMA (CVE-2023-44221, CVE-2024-38475)Watchtower Labs · 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 CatalogAll 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
-
Public PoC available
Public proof-of-concept code published
-
KEV confirmed by The Shadowserver
Exploitation attested by an external source
-
Nuclei template available
Scanner coverage available
-
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
CVE published
Vulnerability disclosed publicly
-
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.
- 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 }
}Early warning alerts
Get alerts on high-impact exploitation
Receive curator-selected alerts when exploitation activity warrants attention. Each alert includes the evidence and context needed to decide what requires attention now.