CVE-2011-3639 (GCVE-0-2011-3639)
Vulnerability from cvelistv5 – Published: 2011-11-30 02:00 – Updated: 2024-08-06 23:37
VLAI
EPSS
VEX
Summary
The mod_proxy module in the Apache HTTP Server 2.0.x through 2.0.64 and 2.2.x before 2.2.18, when the Revision 1179239 patch is in place, does not properly interact with use of (1) RewriteRule and (2) ProxyPassMatch pattern matches for configuration of a reverse proxy, which allows remote attackers to send requests to intranet servers by using the HTTP/0.9 protocol with a malformed URI containing an initial @ (at sign) character. NOTE: this vulnerability exists because of an incomplete fix for CVE-2011-3368.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://bugzilla.redhat.com/show_bug.cgi?id=752080 | x_refsource_CONFIRM |
| http://rhn.redhat.com/errata/RHSA-2012-0128.html | vendor-advisoryx_refsource_REDHAT |
| http://svn.apache.org/viewvc?view=revision&revisi… | x_refsource_CONFIRM |
| http://www.debian.org/security/2012/dsa-2405 | vendor-advisoryx_refsource_DEBIAN |
Date Public
2011-11-15 00:00
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"value": "El m\u00f3dulo mod_proxy en el servidor HTTP Apache v2.0.x hasta v2.0.64 y v2.2.x hasta v2.2.18, cuando la revisi\u00f3n 1179239 se realiza, no interact\u00faa con el uso de patrones de coincidencia (1) RewriteRule y (2) ProxyPassMatch para configuraci\u00f3n de un proxy inverso, lo que permite a atacantes remotos enviar peticiones a servidores de la intranet a trav\u00e9s de URI mal formadas que contienen el caracter \u0027@\u0027: caracter en una posici\u00f3n inv\u00e1lida. NOTA: esta vulnerabilidad existe debido a una soluci\u00f3n incompleta para CVE-2011-3368."
}
],
"id": "CVE-2011-3639",
"lastModified": "2026-04-29T01:13:23.040",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "MEDIUM",
"cvssData": {
"accessComplexity": "MEDIUM",
"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "NONE",
"baseScore": 4.3,
"confidentialityImpact": "NONE",
"integrityImpact": "PARTIAL",
"vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N",
"version": "2.0"
},
"exploitabilityScore": 8.6,
"impactScore": 2.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
"userInteractionRequired": false
}
]
},
"published": "2011-11-30T04:05:58.437",
"references": [
{
"source": "secalert@redhat.com",
"url": "http://rhn.redhat.com/errata/RHSA-2012-0128.html"
},
{
"source": "secalert@redhat.com",
"url": "http://svn.apache.org/viewvc?view=revision\u0026revision=1188745"
},
{
"source": "secalert@redhat.com",
"url": "http://www.debian.org/security/2012/dsa-2405"
},
{
"source": "secalert@redhat.com",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=752080"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://rhn.redhat.com/errata/RHSA-2012-0128.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://svn.apache.org/viewvc?view=revision\u0026revision=1188745"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://www.debian.org/security/2012/dsa-2405"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=752080"
}
],
"sourceIdentifier": "secalert@redhat.com",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-20"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-08-04T22:06:09+00:00",
"cve": "CVE-2011-3639",
"id": "CVE-2011-3639",
"initial_release_date": "2011-10-26T00:00:00+00:00",
"product_status:fixed": "108",
"product_status:known_affected": "1",
"product_status:known_not_affected": "2",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "httpd: http 0.9 request bypass of the reverse proxy vulnerability CVE-2011-3368 fix",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2011/cve-2011-3639.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2025-07-08T00:29:50Z",
"cve": "CVE-2011-3639",
"id": "CVE-2011-3639",
"initial_release_date": "2023-02-15T05:50:39Z",
"product_status:recommended": "46",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2011-3639",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2011-3639.json",
"version": "6"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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