FKIE_CVE-2012-0021
Vulnerability from fkie_nvd - Published: 2012-01-28 04:05 - Updated: 2026-06-16 23:36
Severity
Summary
The log_cookie function in mod_log_config.c in the mod_log_config module in the Apache HTTP Server 2.2.17 through 2.2.21, when a threaded MPM is used, does not properly handle a %{}C format string, which allows remote attackers to cause a denial of service (daemon crash) via a cookie that lacks both a name and a value.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| apache | http_server | 2.2.17 | |
| apache | http_server | 2.2.18 | |
| apache | http_server | 2.2.19 | |
| apache | http_server | 2.2.20 | |
| apache | http_server | 2.2.21 |
{
"affected": [
{
"affectedData": [
{
"product": "n/a",
"vendor": "n/a",
"versions": [
{
"status": "affected",
"version": "n/a"
}
]
}
],
"source": "secalert@redhat.com"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:apache:http_server:2.2.17:*:*:*:*:*:*:*",
"matchCriteriaId": "A71F4154-AD20-4EEA-9E2E-D3385C357DA5",
"vulnerable": true
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{
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"vulnerable": true
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"vulnerable": true
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{
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"matchCriteriaId": "7ED4892F-C829-4BEA-AB82-6A78F6F2426D",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
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}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "The log_cookie function in mod_log_config.c in the mod_log_config module in the Apache HTTP Server 2.2.17 through 2.2.21, when a threaded MPM is used, does not properly handle a %{}C format string, which allows remote attackers to cause a denial of service (daemon crash) via a cookie that lacks both a name and a value."
},
{
"lang": "es",
"value": "La funci\u00f3n log_cookie en mod_log_config.c en el m\u00f3dulo de mod_log_config en Apache HTTP Server v2.2.17 a v2.2.21, cuando se usa MPM multihilo , no controla correctamente una cadena de formato %{}C , lo que permite a atacantes remotos provocar una denegaci\u00f3n de servicio (ca\u00edda del demonio) a trav\u00e9s de una cookie que carece de un nombre y un valor."
}
],
"id": "CVE-2012-0021",
"lastModified": "2026-06-16T23:36:30.433",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "LOW",
"cvssData": {
"accessComplexity": "HIGH",
"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "PARTIAL",
"baseScore": 2.6,
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"vectorString": "AV:N/AC:H/Au:N/C:N/I:N/A:P",
"version": "2.0"
},
"exploitabilityScore": 4.9,
"impactScore": 2.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
"userInteractionRequired": false
}
]
},
"published": "2012-01-28T04:05:00.750",
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"sourceIdentifier": "secalert@redhat.com",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-20"
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],
"source": "nvd@nist.gov",
"type": "Primary"
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}
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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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