CVE-2009-3720 (GCVE-0-2009-3720)
Vulnerability from cvelistv5 – Published: 2009-11-03 16:00 – Updated: 2024-08-07 06:38
VLAI
EPSS
VEX
Summary
The updatePosition function in lib/xmltok_impl.c in libexpat in Expat 2.0.1, as used in Python, PyXML, w3c-libwww, and other software, allows context-dependent attackers to cause a denial of service (application crash) via an XML document with crafted UTF-8 sequences that trigger a buffer over-read, a different vulnerability than CVE-2009-2625.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
93 references
Date Public
2009-01-17 00:00
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"assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
"assignerShortName": "redhat",
"cveId": "CVE-2009-3720",
"datePublished": "2009-11-03T16:00:00.000Z",
"dateReserved": "2009-10-16T00:00:00.000Z",
"dateUpdated": "2024-08-07T06:38:30.003Z",
"state": "PUBLISHED"
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"epss": {
"cve": "CVE-2009-3720",
"date": "2026-09-16",
"epss": "0.27924",
"percentile": "0.97998"
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"descriptions": "[{\"lang\": \"en\", \"value\": \"The updatePosition function in lib/xmltok_impl.c in libexpat in Expat 2.0.1, as used in Python, PyXML, w3c-libwww, and other software, allows context-dependent attackers to cause a denial of service (application crash) via an XML document with crafted UTF-8 sequences that trigger a buffer over-read, a different vulnerability than CVE-2009-2625.\"}, {\"lang\": \"es\", \"value\": \"La funci\\u00f3n updatePosition en lib/xmltok_impl.c en libexpat en Expat v2.0.1, usado en Python, PyXML, w3c-libwww, ay otros programas, permite a atacantes dependientes de contexto, provocar una denegaci\\u00f3n de servicio (ca\\u00edda de aplicaci\\u00f3n) a trav\\u00e9s de un documento XML con una secuencia de caracteres UTF-8 manipulada que provoca un desbordamiento de b\\u00fafer fuera de l\\u00edmite (over-read). Vulnerabilidad distinta de CVE-2009-2625.\"}]",
"id": "CVE-2009-3720",
"lastModified": "2024-11-21T01:08:02.680",
"metrics": "{\"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": "2009-11-03T16:30:12.563",
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"sourceIdentifier": "secalert@redhat.com",
"vendorComments": "[{\"organization\": \"Red Hat\", \"comment\": \"Red Hat is aware of this issue and is tracking it via the following bug: https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2009-3720\\n\\nThe Red Hat Security Response Team has rated this issue as having moderate security impact in Python, a future update may address this flaw. If a system has PyXML installed, Python will use PyXML for expat-related functions and is then not vulnerable to the issue.\", \"lastModified\": \"2010-03-05T00:00:00\"}]",
"vulnStatus": "Modified",
"weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"NVD-CWE-noinfo\"}]}]"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2009-3720\",\"sourceIdentifier\":\"secalert@redhat.com\",\"published\":\"2009-11-03T16:30:12.563\",\"lastModified\":\"2026-07-20T14:35:41.700\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"The updatePosition function in lib/xmltok_impl.c in libexpat in Expat 2.0.1, as used in Python, PyXML, w3c-libwww, and other software, allows context-dependent attackers to cause a denial of service (application crash) via an XML document with crafted UTF-8 sequences that trigger a buffer over-read, a different vulnerability than CVE-2009-2625.\"},{\"lang\":\"es\",\"value\":\"La funci\u00f3n updatePosition en lib/xmltok_impl.c en libexpat en Expat v2.0.1, usado en Python, PyXML, w3c-libwww, ay otros programas, permite a atacantes dependientes de contexto, provocar una denegaci\u00f3n de servicio (ca\u00edda de aplicaci\u00f3n) a trav\u00e9s de un documento XML con una secuencia de caracteres UTF-8 manipulada que provoca un desbordamiento de b\u00fafer fuera de l\u00edmite (over-read). Vulnerabilidad distinta de 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Advisory\"]},{\"url\":\"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11019\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Broken Link\"]},{\"url\":\"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12719\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Broken Link\"]},{\"url\":\"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7112\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00370.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00413.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://www.redhat.com/archives/fedora-package-announce/2009-December/msg01274.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]}],\"vendorComments\":[{\"organization\":\"Red Hat\",\"comment\":\"Red Hat is aware of this issue and is tracking it via the following bug: https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2009-3720\\n\\nThe Red Hat Security Response Team has rated this issue as having moderate security impact in Python, a future update may address this flaw. If a system has PyXML installed, Python will use PyXML for expat-related functions and is then not vulnerable to the issue.\",\"lastModified\":\"2010-03-05T00:00:00\"}]}}",
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2025-11-21T13:09:57+00:00",
"cve": "CVE-2009-3720",
"id": "CVE-2009-3720",
"initial_release_date": "2009-01-17T00:00:00+00:00",
"product_status:fixed": "674",
"product_status:known_not_affected": "18",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "expat: buffer over-read and crash on XML with malformed UTF-8 sequences",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2009/cve-2009-3720.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-02T13:06:15Z",
"cve": "CVE-2009-3720",
"id": "CVE-2009-3720",
"initial_release_date": "2023-02-15T06:02:09Z",
"product_status:known_not_affected": "831",
"product_status:recommended": "594",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2009-3720",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2009-3720.json",
"version": "36"
}
}
}
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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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