CVE-2013-6422 (GCVE-0-2013-6422)

Vulnerability from cvelistv5 – Published: 2013-12-23 22:00 – Updated: 2024-08-06 17:39
VLAI
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
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
Show details on NVD website

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                    "criteria": "cpe:2.3:a:haxx:libcurl:7.28.1:*:*:*:*:*:*:*",
                    "matchCriteriaId": "9E66A332-ECD1-4452-B444-FB629022FDF0",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:a:haxx:libcurl:7.29.0:*:*:*:*:*:*:*",
                    "matchCriteriaId": "CDD3D599-35E9-4590-B5E0-3AF04D344695",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:a:haxx:libcurl:7.30.0:*:*:*:*:*:*:*",
                    "matchCriteriaId": "A3B6BFFB-7967-482C-9B49-4BD25C815299",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:a:haxx:libcurl:7.31.0:*:*:*:*:*:*:*",
                    "matchCriteriaId": "1791BF6D-2C96-4A6E-90D4-2906A73601F6",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:a:haxx:libcurl:7.32.0:*:*:*:*:*:*:*",
                    "matchCriteriaId": "260DD751-4145-4B75-B892-5FC932C6A305",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:a:haxx:libcurl:7.33.0:*:*:*:*:*:*:*",
                    "matchCriteriaId": "EFF4AD0D-2EC5-4CE8-B6B3-2EC8ED2FF118",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "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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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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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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