CVE-2009-1955 (GCVE-0-2009-1955)
Vulnerability from cvelistv5 – Published: 2009-06-06 18:00 – Updated: 2024-08-07 05:36
VLAI
EPSS
VEX
Summary
The expat XML parser in the apr_xml_* interface in xml/apr_xml.c in Apache APR-util before 1.3.7, as used in the mod_dav and mod_dav_svn modules in the Apache HTTP Server, allows remote attackers to cause a denial of service (memory consumption) via a crafted XML document containing a large number of nested entity references, as demonstrated by a PROPFIND request, a similar issue to CVE-2003-1564.
Severity
7.5 (High)
CWE
- n/a
Assigner
References
60 references
Date Public
2009-06-03 00:00
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"cveMetadata": {
"assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
"assignerShortName": "mitre",
"cveId": "CVE-2009-1955",
"datePublished": "2009-06-06T18:00:00.000Z",
"dateReserved": "2009-06-06T00:00:00.000Z",
"dateUpdated": "2024-08-07T05:36:19.503Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2009-1955",
"date": "2026-09-16",
"epss": "0.52988",
"percentile": "0.98919"
},
"fkie_nvd": {
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"descriptions": "[{\"lang\": \"en\", \"value\": \"The expat XML parser in the apr_xml_* interface in xml/apr_xml.c in Apache APR-util before 1.3.7, as used in the mod_dav and mod_dav_svn modules in the Apache HTTP Server, allows remote attackers to cause a denial of service (memory consumption) via a crafted XML document containing a large number of nested entity references, as demonstrated by a PROPFIND request, a similar issue to CVE-2003-1564.\"}, {\"lang\": \"es\", \"value\": \"El parseador XML en el interfaz apr_xml_* en xml/apr_xml.c en Apache APR-util anteriores a v1.3.7 tal y como es utilizado en los m\\u00f3dulos mod_dav y mod_dav_svn en el servidor HTTP de Apache, permite a atacantes remotos producir una denegaci\\u00f3n de servicio (agotamiento de memoria) a trav\\u00e9s de un documento XML manipulado que contiene un gran numero de referencias anidadas, como se demostr\\u00f3 en la petici\\u00f3n PROPFIND, una vulnerabilidad similar a CVE-2003-1564.\"}]",
"id": "CVE-2009-1955",
"lastModified": "2024-11-21T01:03:46.790",
"metrics": "{\"cvssMetricV31\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"baseScore\": 7.5, \"baseSeverity\": \"HIGH\", \"attackVector\": \"NETWORK\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"NONE\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 3.9, \"impactScore\": 3.6}], \"cvssMetricV2\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"2.0\", \"vectorString\": \"AV:N/AC:L/Au:N/C:N/I:N/A:P\", \"baseScore\": 5.0, \"accessVector\": \"NETWORK\", \"accessComplexity\": \"LOW\", \"authentication\": \"NONE\", \"confidentialityImpact\": \"NONE\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"PARTIAL\"}, \"baseSeverity\": \"MEDIUM\", \"exploitabilityScore\": 10.0, \"impactScore\": 2.9, \"acInsufInfo\": false, \"obtainAllPrivilege\": false, \"obtainUserPrivilege\": false, \"obtainOtherPrivilege\": false, \"userInteractionRequired\": false}]}",
"published": "2009-06-08T01:00:00.687",
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"sourceIdentifier": "cve@mitre.org",
"vulnStatus": "Modified",
"weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-776\"}]}]"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2009-1955\",\"sourceIdentifier\":\"cve@mitre.org\",\"published\":\"2009-06-08T01:00:00.687\",\"lastModified\":\"2026-04-23T00:35:47.467\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"The expat XML parser in the apr_xml_* interface in xml/apr_xml.c in Apache APR-util before 1.3.7, as used in the mod_dav and mod_dav_svn modules in the Apache HTTP Server, allows remote attackers to cause a denial of service (memory consumption) via a crafted XML document containing a large number of nested entity references, as demonstrated by a PROPFIND request, a similar issue to CVE-2003-1564.\"},{\"lang\":\"es\",\"value\":\"El parseador XML en el interfaz apr_xml_* en xml/apr_xml.c en Apache APR-util anteriores a v1.3.7 tal y como es utilizado en los m\u00f3dulos mod_dav y mod_dav_svn en el servidor HTTP de Apache, permite a atacantes remotos producir una denegaci\u00f3n de servicio (agotamiento de memoria) a trav\u00e9s de un documento XML manipulado que contiene un gran numero de referencias anidadas, como se demostr\u00f3 en la petici\u00f3n PROPFIND, una vulnerabilidad similar a 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"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2025-11-21T13:11:45+00:00",
"cve": "CVE-2009-1955",
"id": "CVE-2009-1955",
"initial_release_date": "2009-06-01T00:00:00+00:00",
"product_status:fixed": "405",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "apr-util billion laughs attack",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2009/cve-2009-1955.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-09-16T00:38:44Z",
"cve": "CVE-2009-1955",
"id": "CVE-2009-1955",
"initial_release_date": "2023-02-15T06:03:36Z",
"product_status:recommended": "221",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2009-1955",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2009-1955.json",
"version": "25"
}
}
}
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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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