CVE-2016-4979 (GCVE-0-2016-4979)
Vulnerability from cvelistv5 – Published: 2016-07-06 14:00 – Updated: 2024-08-06 00:46
VLAI
EPSS
VEX
Summary
The Apache HTTP Server 2.4.18 through 2.4.20, when mod_http2 and mod_ssl are enabled, does not properly recognize the "SSLVerifyClient require" directive for HTTP/2 request authorization, which allows remote attackers to bypass intended access restrictions by leveraging the ability to send multiple requests over a single connection and aborting a renegotiation.
Severity
7.5 (High)
CWE
- n/a
Assigner
References
25 references
Date Public
2016-07-05 00:00
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}
],
"id": "CVE-2016-4979",
"lastModified": "2026-05-06T22:30:45.220",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "MEDIUM",
"cvssData": {
"accessComplexity": "LOW",
"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "NONE",
"baseScore": 5.0,
"confidentialityImpact": "NONE",
"integrityImpact": "PARTIAL",
"vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
"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": "NONE",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
"version": "3.0"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2016-07-06T14:59:04.487",
"references": [
{
"source": "secalert@redhat.com",
"tags": [
"Patch",
"Vendor Advisory"
],
"url": "http://httpd.apache.org/security/vulnerabilities_24.html"
},
{
"source": "secalert@redhat.com",
"url": "http://packetstormsecurity.com/files/137771/Apache-2.4.20-X509-Authentication-Bypass.html"
},
{
"source": "secalert@redhat.com",
"url": "http://seclists.org/fulldisclosure/2016/Jul/11"
},
{
"source": "secalert@redhat.com",
"url": "http://www.apache.org/dist/httpd/CHANGES_2.4"
},
{
"source": "secalert@redhat.com",
"url": "http://www.openwall.com/lists/oss-security/2016/07/05/5"
},
{
"source": "secalert@redhat.com",
"url": "http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html"
},
{
"source": "secalert@redhat.com",
"url": "http://www.oracle.com/technetwork/topics/security/bulletinoct2016-3090566.html"
},
{
"source": "secalert@redhat.com",
"url": "http://www.securityfocus.com/bid/91566"
},
{
"source": "secalert@redhat.com",
"url": "http://www.securitytracker.com/id/1036225"
},
{
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"url": "https://access.redhat.com/errata/RHSA-2016:1420"
},
{
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"url": "https://github.com/apache/httpd/commit/2d0e4eff04ea963128a41faaef21f987272e05a2"
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},
{
"source": "secalert@redhat.com",
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},
{
"source": "secalert@redhat.com",
"url": "https://lists.apache.org/thread.html/re1e3a24664d35bcd0a0e793e0b5fc6ca6c107f99a1b2c545c5d4b467%40%3Ccvs.httpd.apache.org%3E"
},
{
"source": "secalert@redhat.com",
"url": "https://lists.apache.org/thread.html/re3d27b6250aa8548b8845d314bb8a350b3df326cacbbfdfe4d455234%40%3Ccvs.httpd.apache.org%3E"
},
{
"source": "secalert@redhat.com",
"url": "https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E"
},
{
"source": "secalert@redhat.com",
"url": "https://security.gentoo.org/glsa/201610-02"
},
{
"source": "secalert@redhat.com",
"url": "https://security.netapp.com/advisory/ntap-20180601-0001/"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch",
"Vendor Advisory"
],
"url": "http://httpd.apache.org/security/vulnerabilities_24.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://packetstormsecurity.com/files/137771/Apache-2.4.20-X509-Authentication-Bypass.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://seclists.org/fulldisclosure/2016/Jul/11"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://www.apache.org/dist/httpd/CHANGES_2.4"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://www.openwall.com/lists/oss-security/2016/07/05/5"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html"
},
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"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://www.oracle.com/technetwork/topics/security/bulletinoct2016-3090566.html"
},
{
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"url": "http://www.securityfocus.com/bid/91566"
},
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"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://www.securitytracker.com/id/1036225"
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],
"sourceIdentifier": "secalert@redhat.com",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-284"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-08-04T21:58:48+00:00",
"cve": "CVE-2016-4979",
"id": "CVE-2016-4979",
"initial_release_date": "2016-07-05T00:00:00+00:00",
"product_status:fixed": "80",
"product_status:known_not_affected": "32",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "httpd: X509 client certificate authentication bypass using HTTP/2",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2016/cve-2016-4979.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-07-26T01:00:13Z",
"cve": "CVE-2016-4979",
"id": "CVE-2016-4979",
"initial_release_date": "2023-02-15T05:02:10Z",
"product_status:known_affected": "394",
"product_status:known_not_affected": "200",
"product_status:recommended": "387",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2016-4979",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2016-4979.json",
"version": "32"
}
}
}
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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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