CVE-2013-6422 (GCVE-0-2013-6422)
Vulnerability from cvelistv5 – Published: 2013-12-23 22:00 – Updated: 2024-08-06 17:39
VLAI
EPSS
VEX
Summary
The GnuTLS backend in libcurl 7.21.4 through 7.33.0, when disabling digital signature verification (CURLOPT_SSL_VERIFYPEER), also disables the CURLOPT_SSL_VERIFYHOST check for CN or SAN host name fields, which makes it easier for remote attackers to spoof servers and conduct man-in-the-middle (MITM) attacks.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
5 references
| URL | Tags |
|---|---|
| http://curl.haxx.se/docs/adv_20131217.html | x_refsource_CONFIRM |
| http://www.oracle.com/technetwork/topics/security… | x_refsource_CONFIRM |
| https://h20564.www2.hp.com/hpsc/doc/public/displa… | vendor-advisoryx_refsource_HP |
| http://www.debian.org/security/2013/dsa-2824 | vendor-advisoryx_refsource_DEBIAN |
| http://www.ubuntu.com/usn/USN-2058-1 | vendor-advisoryx_refsource_UBUNTU |
Date Public
2013-12-17 00:00
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"value": "The GnuTLS backend in libcurl 7.21.4 through 7.33.0, when disabling digital signature verification (CURLOPT_SSL_VERIFYPEER), also disables the CURLOPT_SSL_VERIFYHOST check for CN or SAN host name fields, which makes it easier for remote attackers to spoof servers and conduct man-in-the-middle (MITM) attacks."
},
{
"lang": "es",
"value": "El backend de GnuTLS en libcurl 7.21.4 a 7.33.0, cuando se desactiva la verificaci\u00f3n de firmas digitales (CURLOPT_SSL_VERIFYPEER), tambi\u00e9n desactiva la comprobaci\u00f3n CURLOPT_SSL_VERIFYHOST para nombres de host CN o SAN, lo cual facilita a atacantes remotos la suplantaci\u00f3n de servidores y la ejecuci\u00f3n de ataques man-in-the-middle (MITM)."
}
],
"id": "CVE-2013-6422",
"lastModified": "2026-04-29T01:13:23.040",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "MEDIUM",
"cvssData": {
"accessComplexity": "HIGH",
"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "NONE",
"baseScore": 4.0,
"confidentialityImpact": "PARTIAL",
"integrityImpact": "PARTIAL",
"vectorString": "AV:N/AC:H/Au:N/C:P/I:P/A:N",
"version": "2.0"
},
"exploitabilityScore": 4.9,
"impactScore": 4.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
"userInteractionRequired": false
}
]
},
"published": "2013-12-23T22:55:02.943",
"references": [
{
"source": "secalert@redhat.com",
"tags": [
"Vendor Advisory"
],
"url": "http://curl.haxx.se/docs/adv_20131217.html"
},
{
"source": "secalert@redhat.com",
"url": "http://www.debian.org/security/2013/dsa-2824"
},
{
"source": "secalert@redhat.com",
"url": "http://www.oracle.com/technetwork/topics/security/cpujul2015-2367936.html"
},
{
"source": "secalert@redhat.com",
"url": "http://www.ubuntu.com/usn/USN-2058-1"
},
{
"source": "secalert@redhat.com",
"url": "https://h20564.www2.hp.com/hpsc/doc/public/display?docId=emr_na-c04463322"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Vendor Advisory"
],
"url": "http://curl.haxx.se/docs/adv_20131217.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://www.debian.org/security/2013/dsa-2824"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://www.oracle.com/technetwork/topics/security/cpujul2015-2367936.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://www.ubuntu.com/usn/USN-2058-1"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://h20564.www2.hp.com/hpsc/doc/public/display?docId=emr_na-c04463322"
}
],
"sourceIdentifier": "secalert@redhat.com",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-20"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Low",
"current_release_date": "2025-11-21T12:36:51+00:00",
"cve": "CVE-2013-6422",
"id": "CVE-2013-6422",
"initial_release_date": "2013-12-17T00:00:00+00:00",
"product_status:known_not_affected": "9",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "curl: TLS/SSL certificate name check disabled with peer verification when using GnuTLS",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2013/cve-2013-6422.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-05-02T01:36:02Z",
"cve": "CVE-2013-6422",
"id": "CVE-2013-6422",
"initial_release_date": "2023-02-15T05:34:12Z",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2013-6422",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2013-6422.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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