FKIE_CVE-2016-8740
Vulnerability from fkie_nvd - Published: 2016-12-05 19:59 - Updated: 2026-06-17 00:54
Severity
Summary
The mod_http2 module in the Apache HTTP Server 2.4.17 through 2.4.23, when the Protocols configuration includes h2 or h2c, does not restrict request-header length, which allows remote attackers to cause a denial of service (memory consumption) via crafted CONTINUATION frames in an HTTP/2 request.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| apache | http_server | 2.4.17 | |
| apache | http_server | 2.4.18 | |
| apache | http_server | 2.4.19 | |
| apache | http_server | 2.4.20 | |
| apache | http_server | 2.4.21 | |
| apache | http_server | 2.4.22 | |
| apache | http_server | 2.4.23 |
{
"affected": [
{
"affectedData": [
{
"product": "Apache HTTP Server",
"vendor": "Apache Software Foundation",
"versions": [
{
"status": "affected",
"version": "2.4.17 - 2.4.23"
}
]
}
],
"source": "security@apache.org"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:apache:http_server:2.4.17:*:*:*:*:*:*:*",
"matchCriteriaId": "E1F45B27-504B-4202-87B8-BD3B094003F1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:apache:http_server:2.4.18:*:*:*:*:*:*:*",
"matchCriteriaId": "F2FB2B98-DFD2-420A-8A7F-9B288651242F",
"vulnerable": true
},
{
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"matchCriteriaId": "2AE538EE-7152-4DB5-AE45-614494CB7B95",
"vulnerable": true
},
{
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"matchCriteriaId": "B803D25B-0A19-4569-BA05-09D58F33917C",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:apache:http_server:2.4.21:*:*:*:*:*:*:*",
"matchCriteriaId": "BE253E49-9A56-49C8-B1D8-E23BB3D5D1D7",
"vulnerable": true
},
{
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"matchCriteriaId": "DE5A73E5-1A04-420B-92B2-B90FD970005C",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:apache:http_server:2.4.23:*:*:*:*:*:*:*",
"matchCriteriaId": "8510442C-212F-4013-85FA-E0AB59F6F2C6",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "The mod_http2 module in the Apache HTTP Server 2.4.17 through 2.4.23, when the Protocols configuration includes h2 or h2c, does not restrict request-header length, which allows remote attackers to cause a denial of service (memory consumption) via crafted CONTINUATION frames in an HTTP/2 request."
},
{
"lang": "es",
"value": "El m\u00f3dulo mod_http2 en el Apache HTTP Server 2.4.17 hasta la versi\u00f3n 2.4.23, cuando la configuraci\u00f3n Protocols incluye h2 o h2c, no restringe la longitud de la cabecera de petici\u00f3n, lo que permite a atacantes remotos provocar una denegaci\u00f3n de servicio (corrupci\u00f3n de memoria) a trav\u00e9s de marcos CONTINUATION manipulados en una petici\u00f3n HTTP/2."
}
],
"id": "CVE-2016-8740",
"lastModified": "2026-06-17T00:54:55.280",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "MEDIUM",
"cvssData": {
"accessComplexity": "LOW",
"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "PARTIAL",
"baseScore": 5.0,
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
"version": "2.0"
},
"exploitabilityScore": 10.0,
"impactScore": 2.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
"userInteractionRequired": false
}
],
"cvssMetricV30": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.0"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2016-12-05T19:59:00.250",
"references": [
{
"source": "security@apache.org",
"tags": [
"Exploit",
"Third Party Advisory",
"VDB Entry"
],
"url": "http://packetstormsecurity.com/files/140023/Apache-HTTPD-Web-Server-2.4.23-Memory-Exhaustion.html"
},
{
"source": "security@apache.org",
"url": "http://rhn.redhat.com/errata/RHSA-2017-1415.html"
},
{
"source": "security@apache.org",
"tags": [
"Third Party Advisory",
"VDB Entry"
],
"url": "http://www.securityfocus.com/bid/94650"
},
{
"source": "security@apache.org",
"tags": [
"Third Party Advisory",
"VDB Entry"
],
"url": "http://www.securitytracker.com/id/1037388"
},
{
"source": "security@apache.org",
"url": "https://access.redhat.com/errata/RHSA-2017:1161"
},
{
"source": "security@apache.org",
"url": "https://access.redhat.com/errata/RHSA-2017:1413"
},
{
"source": "security@apache.org",
"url": "https://access.redhat.com/errata/RHSA-2017:1414"
},
{
"source": "security@apache.org",
"tags": [
"Issue Tracking",
"Patch",
"Third Party Advisory"
],
"url": "https://github.com/apache/httpd/commit/29c63b786ae028d82405421585e91283c8fa0da3"
},
{
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"url": "https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US\u0026docId=emr_na-hpesbux03725en_us"
},
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},
{
"source": "security@apache.org",
"url": "https://security.gentoo.org/glsa/201701-36"
},
{
"source": "security@apache.org",
"url": "https://security.netapp.com/advisory/ntap-20180423-0001/"
},
{
"source": "security@apache.org",
"url": "https://support.apple.com/HT208221"
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],
"sourceIdentifier": "security@apache.org",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-20"
},
{
"lang": "en",
"value": "CWE-399"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
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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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