CVE-2011-4539 (GCVE-0-2011-4539)
Vulnerability from cvelistv5 – Published: 2011-12-08 11:00 – Updated: 2024-08-07 00:09
VLAI
EPSS
VEX
Summary
dhcpd in ISC DHCP 4.x before 4.2.3-P1 and 4.1-ESV before 4.1-ESV-R4 does not properly handle regular expressions in dhcpd.conf, which allows remote attackers to cause a denial of service (daemon crash) via a crafted request packet.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
13 references
Date Public
2011-12-07 00:00
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"exploitabilityScore": 10.0,
"impactScore": 2.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
"userInteractionRequired": false
}
]
},
"published": "2011-12-08T11:55:02.407",
"references": [
{
"source": "cve@mitre.org",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"url": "http://lists.fedoraproject.org/pipermail/package-announce/2011-December/070980.html"
},
{
"source": "cve@mitre.org",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"url": "http://lists.fedoraproject.org/pipermail/package-announce/2012-January/071549.html"
},
{
"source": "cve@mitre.org",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"url": "http://lists.opensuse.org/opensuse-updates/2011-12/msg00006.html"
},
{
"source": "cve@mitre.org",
"tags": [
"Third Party Advisory"
],
"url": "http://secunia.com/advisories/47153"
},
{
"source": "cve@mitre.org",
"tags": [
"Third Party Advisory"
],
"url": "http://secunia.com/advisories/47178"
},
{
"source": "cve@mitre.org",
"tags": [
"Third Party Advisory"
],
"url": "http://security.gentoo.org/glsa/glsa-201301-06.xml"
},
{
"source": "cve@mitre.org",
"tags": [
"Third Party Advisory"
],
"url": "http://www.debian.org/security/2012/dsa-2519"
},
{
"source": "cve@mitre.org",
"tags": [
"Third Party Advisory"
],
"url": "http://www.mandriva.com/security/advisories?name=MDVSA-2011:182"
},
{
"source": "cve@mitre.org",
"tags": [
"Third Party Advisory",
"VDB Entry"
],
"url": "http://www.securityfocus.com/bid/50971"
},
{
"source": "cve@mitre.org",
"tags": [
"Third Party Advisory",
"VDB Entry"
],
"url": "http://www.securitytracker.com/id?1026393"
},
{
"source": "cve@mitre.org",
"tags": [
"Third Party Advisory"
],
"url": "http://www.ubuntu.com/usn/USN-1309-1"
},
{
"source": "cve@mitre.org",
"tags": [
"Third Party Advisory",
"VDB Entry"
],
"url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/71680"
},
{
"source": "cve@mitre.org",
"tags": [
"Vendor Advisory"
],
"url": "https://www.isc.org/software/dhcp/advisories/cve-2011-4539"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"url": "http://lists.fedoraproject.org/pipermail/package-announce/2011-December/070980.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"url": "http://lists.fedoraproject.org/pipermail/package-announce/2012-January/071549.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"url": "http://lists.opensuse.org/opensuse-updates/2011-12/msg00006.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Third Party Advisory"
],
"url": "http://secunia.com/advisories/47153"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Third Party Advisory"
],
"url": "http://secunia.com/advisories/47178"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Third Party Advisory"
],
"url": "http://security.gentoo.org/glsa/glsa-201301-06.xml"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Third Party Advisory"
],
"url": "http://www.debian.org/security/2012/dsa-2519"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Third Party Advisory"
],
"url": "http://www.mandriva.com/security/advisories?name=MDVSA-2011:182"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Third Party Advisory",
"VDB Entry"
],
"url": "http://www.securityfocus.com/bid/50971"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Third Party Advisory",
"VDB Entry"
],
"url": "http://www.securitytracker.com/id?1026393"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Third Party Advisory"
],
"url": "http://www.ubuntu.com/usn/USN-1309-1"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Third Party Advisory",
"VDB Entry"
],
"url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/71680"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Vendor Advisory"
],
"url": "https://www.isc.org/software/dhcp/advisories/cve-2011-4539"
}
],
"sourceIdentifier": "cve@mitre.org",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-20"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2025-11-21T12:54:55+00:00",
"cve": "CVE-2011-4539",
"id": "CVE-2011-4539",
"initial_release_date": "2011-12-07T00:00:00+00:00",
"product_status:fixed": "200",
"product_status:known_not_affected": "2",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "dhcp: DoS due to processing certain regular expressions",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2011/cve-2011-4539.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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