{
  "document": {
    "aggregate_severity": {
      "text": "Medium"
    },
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "TuxCare License Agreement",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
        "title": "Terms of Use"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "https://tuxcare.com/contact/",
      "name": "TuxCare",
      "namespace": "https://tuxcare.com/"
    },
    "references": [
      {
        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.tuxcare.com/csaf/v2/els_os/centos7els/vex/2021/cve-2021-3672-els_os-centos7els.json"
      }
    ],
    "tracking": {
      "current_release_date": "2026-04-10T19:33:45Z",
      "generator": {
        "date": "2026-04-10T19:33:45Z",
        "engine": {
          "name": "pyCSAF"
        }
      },
      "id": "CVE-2021-3672-ELS_OS-CENTOS7ELS",
      "initial_release_date": "2021-11-23T19:15:00Z",
      "revision_history": [
        {
          "date": "2021-11-23T19:15:00Z",
          "number": "1",
          "summary": "Initial version"
        },
        {
          "date": "2026-04-10T19:33:45Z",
          "number": "2",
          "summary": "Official Publication"
        }
      ],
      "status": "final",
      "version": "2"
    },
    "title": "Security update on CVE-2021-3672"
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_name",
                "name": "Community Enterprise Operating System 7",
                "product": {
                  "name": "Community Enterprise Operating System 7",
                  "product_id": "CentOS-7",
                  "product_identification_helper": {
                    "cpe": "cpe:2.3:o:centos:centos:7:*:*:*:*:*:*:*"
                  }
                }
              }
            ],
            "category": "product_family",
            "name": "Community Enterprise Operating System"
          }
        ],
        "category": "vendor",
        "name": "Red Hat, Inc."
      },
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "c-ares-devel-0:1.10.0-3.el7_9.1.tuxcare.els1.x86_64",
                "product": {
                  "name": "c-ares-devel-0:1.10.0-3.el7_9.1.tuxcare.els1.x86_64",
                  "product_id": "c-ares-devel-0:1.10.0-3.el7_9.1.tuxcare.els1.x86_64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/tuxcare/c-ares-devel@1.10.0-3.el7_9.1.tuxcare.els1?arch=x86_64"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "c-ares-0:1.10.0-3.el7_9.1.tuxcare.els1.x86_64",
                "product": {
                  "name": "c-ares-0:1.10.0-3.el7_9.1.tuxcare.els1.x86_64",
                  "product_id": "c-ares-0:1.10.0-3.el7_9.1.tuxcare.els1.x86_64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/tuxcare/c-ares@1.10.0-3.el7_9.1.tuxcare.els1?arch=x86_64"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "x86_64"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "c-ares-devel-0:1.10.0-3.el7_9.1.tuxcare.els1.i686",
                "product": {
                  "name": "c-ares-devel-0:1.10.0-3.el7_9.1.tuxcare.els1.i686",
                  "product_id": "c-ares-devel-0:1.10.0-3.el7_9.1.tuxcare.els1.i686",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/tuxcare/c-ares-devel@1.10.0-3.el7_9.1.tuxcare.els1?arch=i686"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "c-ares-0:1.10.0-3.el7_9.1.tuxcare.els1.i686",
                "product": {
                  "name": "c-ares-0:1.10.0-3.el7_9.1.tuxcare.els1.i686",
                  "product_id": "c-ares-0:1.10.0-3.el7_9.1.tuxcare.els1.i686",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/tuxcare/c-ares@1.10.0-3.el7_9.1.tuxcare.els1?arch=i686"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "i686"
          }
        ],
        "category": "vendor",
        "name": "TuxCare"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "c-ares-devel-0:1.10.0-3.el7_9.1.tuxcare.els1.x86_64 as a component of Community Enterprise Operating System 7",
          "product_id": "CentOS-7:c-ares-devel-0:1.10.0-3.el7_9.1.tuxcare.els1.x86_64"
        },
        "product_reference": "c-ares-devel-0:1.10.0-3.el7_9.1.tuxcare.els1.x86_64",
        "relates_to_product_reference": "CentOS-7"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "c-ares-devel-0:1.10.0-3.el7_9.1.tuxcare.els1.i686 as a component of Community Enterprise Operating System 7",
          "product_id": "CentOS-7:c-ares-devel-0:1.10.0-3.el7_9.1.tuxcare.els1.i686"
        },
        "product_reference": "c-ares-devel-0:1.10.0-3.el7_9.1.tuxcare.els1.i686",
        "relates_to_product_reference": "CentOS-7"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "c-ares-0:1.10.0-3.el7_9.1.tuxcare.els1.x86_64 as a component of Community Enterprise Operating System 7",
          "product_id": "CentOS-7:c-ares-0:1.10.0-3.el7_9.1.tuxcare.els1.x86_64"
        },
        "product_reference": "c-ares-0:1.10.0-3.el7_9.1.tuxcare.els1.x86_64",
        "relates_to_product_reference": "CentOS-7"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "c-ares-0:1.10.0-3.el7_9.1.tuxcare.els1.i686 as a component of Community Enterprise Operating System 7",
          "product_id": "CentOS-7:c-ares-0:1.10.0-3.el7_9.1.tuxcare.els1.i686"
        },
        "product_reference": "c-ares-0:1.10.0-3.el7_9.1.tuxcare.els1.i686",
        "relates_to_product_reference": "CentOS-7"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2021-3672",
      "cwe": {
        "id": "CWE-79",
        "name": "Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')"
      },
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in c-ares library, where a missing input validation check of host names returned by DNS (Domain Name Servers) can lead to output of wrong hostnames which might potentially lead to Domain Hijacking. The highest threat from this vulnerability is to confidentiality and integrity as well as system availability.",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "under_investigation": [
          "CentOS-7:c-ares-0:1.10.0-3.el7_9.1.tuxcare.els1.i686",
          "CentOS-7:c-ares-0:1.10.0-3.el7_9.1.tuxcare.els1.x86_64",
          "CentOS-7:c-ares-devel-0:1.10.0-3.el7_9.1.tuxcare.els1.i686",
          "CentOS-7:c-ares-devel-0:1.10.0-3.el7_9.1.tuxcare.els1.x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2021-3672"
        },
        {
          "category": "external",
          "summary": "https://bugzilla.redhat.com/show_bug.cgi?id=1988342",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1988342"
        },
        {
          "category": "external",
          "summary": "https://c-ares.haxx.se/adv_20210810.html",
          "url": "https://c-ares.haxx.se/adv_20210810.html"
        },
        {
          "category": "external",
          "summary": "https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf",
          "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf"
        },
        {
          "category": "external",
          "summary": "https://security.gentoo.org/glsa/202401-02",
          "url": "https://security.gentoo.org/glsa/202401-02"
        },
        {
          "category": "external",
          "summary": "https://www.oracle.com/security-alerts/cpujul2022.html",
          "url": "https://www.oracle.com/security-alerts/cpujul2022.html"
        }
      ],
      "release_date": "2021-11-23T19:15:00Z",
      "remediations": [
        {
          "category": "none_available",
          "details": "Affected",
          "product_ids": [
            "CentOS-7:c-ares-0:1.10.0-3.el7_9.1.tuxcare.els1.i686",
            "CentOS-7:c-ares-0:1.10.0-3.el7_9.1.tuxcare.els1.x86_64",
            "CentOS-7:c-ares-devel-0:1.10.0-3.el7_9.1.tuxcare.els1.i686",
            "CentOS-7:c-ares-devel-0:1.10.0-3.el7_9.1.tuxcare.els1.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v2": {
            "accessComplexity": "MEDIUM",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "PARTIAL",
            "baseScore": 6.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "PARTIAL",
            "integrityImpact": "PARTIAL",
            "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:P",
            "version": "2.0"
          },
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5.6,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L",
            "version": "3.1"
          },
          "products": [
            "CentOS-7:c-ares-0:1.10.0-3.el7_9.1.tuxcare.els1.i686",
            "CentOS-7:c-ares-0:1.10.0-3.el7_9.1.tuxcare.els1.x86_64",
            "CentOS-7:c-ares-devel-0:1.10.0-3.el7_9.1.tuxcare.els1.i686",
            "CentOS-7:c-ares-devel-0:1.10.0-3.el7_9.1.tuxcare.els1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ]
    }
  ]
}