CVE-2009-1891 (GCVE-0-2009-1891)
Vulnerability from cvelistv5 – Published: 2009-07-10 15:00 – Updated: 2024-08-07 05:27
VLAI
EPSS
VEX
Summary
The mod_deflate module in Apache httpd 2.2.11 and earlier compresses large files until completion even after the associated network connection is closed, which allows remote attackers to cause a denial of service (CPU consumption).
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
55 references
Date Public
2009-06-28 00:00
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"operator": "OR"
}
]
}
],
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{
"lang": "en",
"value": "The mod_deflate module in Apache httpd 2.2.11 and earlier compresses large files until completion even after the associated network connection is closed, which allows remote attackers to cause a denial of service (CPU consumption)."
},
{
"lang": "es",
"value": "El m\u00f3dulo mod_deflate en Apache httpd v2.2.11 y anteriores comprime archivos de gran tama\u00f1o hasta finalizar incluso despu\u00e9s de que la conexi\u00f3n de red asociada est\u00e1 cerrada, lo cual permite a atacantes remotos provocar una denegaci\u00f3n de servicio (consumo de CPU)."
}
],
"id": "CVE-2009-1891",
"lastModified": "2026-06-16T23:08:17.760",
"metrics": {
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{
"acInsufInfo": false,
"baseSeverity": "HIGH",
"cvssData": {
"accessComplexity": "MEDIUM",
"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "COMPLETE",
"baseScore": 7.1,
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:C",
"version": "2.0"
},
"exploitabilityScore": 8.6,
"impactScore": 6.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
"userInteractionRequired": false
}
]
},
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{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
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],
"url": "https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12361"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
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{
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{
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},
{
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"tags": [
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"url": "https://www.redhat.com/archives/fedora-package-announce/2009-August/msg01363.html"
}
],
"sourceIdentifier": "secalert@redhat.com",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-400"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Low",
"current_release_date": "2025-11-21T13:11:22+00:00",
"cve": "CVE-2009-1891",
"id": "CVE-2009-1891",
"initial_release_date": "2009-06-26T00:00:00+00:00",
"product_status:fixed": "495",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "httpd: possible temporary DoS (CPU consumption) in mod_deflate",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2009/cve-2009-1891.json",
"version": "3"
}
}
}
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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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