Exploitation evidence
Known exploited · CISA KEV listed
Added 2025-05-01. Ransomware campaign use: Unknown.
CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CISA due date: 2025-05-22. This is the catalog’s deadline, not an assessment of your organization’s exposure.
KEV checked 13 Nov 2026, 00:20 Jerusalem · Original catalog ↗Reported products and versions
Apache Software Foundation / Apache HTTP Server
Default status: unaffected
- affected: 2.4.0 to ≤ 2.4.59 (semver)
Fixes and workarounds
No explicit solution text in the downloaded CVE record. Consult the vendor advisory; unaffected version ranges are shown above as reported, not inferred as a patch recommendation.
Sources and related reporting
CVE Program record ↗ · Download tracked evidence as JSON
- https://httpd.apache.org/security/vulnerabilities_24.html
- https://security.netapp.com/advisory/ntap-20240712-0001/
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-38475
- https://www.blackhat.com/us-24/briefings/schedule/index.html#confusion-attacks-exploiting-hidden-semantic-ambiguity-in-apache-http-server-pre-recorded-40227
- https://github.com/apache/httpd/commit/9a6157d1e2f7ab15963020381054b48782bc18cf
- http://www.openwall.com/lists/oss-security/2024/07/01/8
- https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2024-0018
Observed change timeline
History begins when Egret first downloads each source. It is not the complete upstream CVE history.
12 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-12",
"epss": 0.99957,
"percentile": 0.99975
}10 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-10",
"epss": 0.99957,
"percentile": 0.99975
}09 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-09",
"epss": 0.99957,
"percentile": 0.99975
}08 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-08",
"epss": 0.99957,
"percentile": 0.99975
}07 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-07",
"epss": 0.99957,
"percentile": 0.99975
}06 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-06",
"epss": 0.99957,
"percentile": 0.99975
}06 Nov 2026, 06:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-05",
"epss": 0.99957,
"percentile": 0.99975
}04 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-04",
"epss": 0.99957,
"percentile": 0.99975
}04 Nov 2026, 06:20 Jerusalem · CVE Program record changed
Stored CNA snapshot at this observation.
{
"containers": {
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{
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{
"cpes": [
"cpe:2.3:a:apache:http_server:2.4.0:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"product": "http_server",
"vendor": "apache",
"versions": [
{
"lessThanOrEqual": "2.4.59",
"status": "affected",
"version": "2.4.0",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:a:netapp:ontap_9:-:*:*:*:*:*:*:*"
],
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"product": "ontap_9",
"vendor": "netapp",
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]
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],
"metrics": [
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"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 9.1,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2024-38475",
"options": [
{
"Exploitation": "active"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2025-05-02T03:55:18.245532Z",
"version": "2.0.3"
},
"type": "ssvc"
}
},
{
"other": {
"content": {
"dateAdded": "2025-05-01",
"reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-38475"
},
"type": "kev"
}
}
],
"providerMetadata": {
"dateUpdated": "2025-10-21T22:55:50.372Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
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"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-38475"
}
],
"timeline": [
{
"lang": "en",
"time": "2025-05-01T00:00:00.000Z",
"value": "CVE-2024-38475 added to CISA KEV"
}
],
"title": "CISA ADP Vulnrichment"
},
{
"providerMetadata": {
"dateUpdated": "2025-11-03T21:55:40.951Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
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"references": [
{
"url": "https://www.blackhat.com/us-24/briefings/schedule/index.html#confusion-attacks-exploiting-hidden-semantic-ambiguity-in-apache-http-server-pre-recorded-40227"
},
{
"url": "https://github.com/apache/httpd/commit/9a6157d1e2f7ab15963020381054b48782bc18cf"
},
{
"tags": [
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"url": "https://httpd.apache.org/security/vulnerabilities_24.html"
},
{
"tags": [
"x_transferred"
],
"url": "https://security.netapp.com/advisory/ntap-20240712-0001/"
},
{
"url": "http://www.openwall.com/lists/oss-security/2024/07/01/8"
},
{
"url": "https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2024-0018"
}
],
"title": "CVE Program Container"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Apache HTTP Server",
"vendor": "Apache Software Foundation",
"versions": [
{
"lessThanOrEqual": "2.4.59",
"status": "affected",
"version": "2.4.0",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Orange Tsai (@orange_8361) from DEVCORE"
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "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. <br><br>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."
}
],
"value": "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. \n\nSubstitutions 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."
}
],
"metrics": [
{
"other": {
"content": {
"text": "important"
},
"type": "Textual description of severity"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-116",
"description": "CWE-116 Improper Encoding or Escaping of Output",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2024-07-12T14:06:09.772Z",
"orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
"shortName": "apache"
},
"references": [
{
"tags": [
"vendor-advisory"
],
"url": "https://httpd.apache.org/security/vulnerabilities_24.html"
},
{
"url": "https://security.netapp.com/advisory/ntap-20240712-0001/"
}
],
"source": {
"discovery": "UNKNOWN"
},
"timeline": [
{
"lang": "en",
"time": "2024-04-01T12:00:00.000Z",
"value": "reported"
}
],
"title": "Apache HTTP Server weakness in mod_rewrite when first segment of substitution matches filesystem path.",
"x_generator": {
"engine": "Vulnogram 0.1.0-dev"
}
}
},
"cveMetadata": {
"assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
"assignerShortName": "apache",
"cveId": "CVE-2024-38475",
"datePublished": "2024-07-01T18:15:12.292Z",
"dateReserved": "2024-06-17T11:09:56.096Z",
"dateUpdated": "2025-11-03T21:55:40.951Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}03 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-03",
"epss": 0.99957,
"percentile": 0.99975
}03 Nov 2026, 02:22 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-02",
"epss": 0.99957,
"percentile": 0.99975
}03 Nov 2026, 02:22 Jerusalem · CISA KEV status changed
Stored KEV snapshot at this observation.
{
"cveID": "CVE-2024-38475",
"cwes": [
"CWE-116"
],
"dateAdded": "2025-05-01",
"dueDate": "2025-05-22",
"forensicTriage": "No",
"knownRansomwareCampaignUse": "Unknown",
"notes": "This vulnerability affects a common open-source component, third-party library, or a protocol used by different products. Please check with specific vendors for information on patching status. For more information, please see: https://httpd.apache.org/security/vulnerabilities_24.html ; https://nvd.nist.gov/vuln/detail/CVE-2024-38475",
"product": "HTTP Server",
"requiredAction": "Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.",
"shortDescription": "Apache HTTP Server contains an improper escaping of output vulnerability in mod_rewrite that 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.",
"vendorProject": "Apache",
"vulnerabilityName": "Apache HTTP Server Improper Escaping of Output Vulnerability"
}