{
  "crds_version": "0.1",
  "kind": "base",
  "id": "crds:cve-2014-6271",
  "revision": 1,
  "title": "Shellshock — Bash Runs Trailing Code From the Environment",
  "summary": "The Bourne-again shell keeps parsing after a function definition inside an environment variable, so anything that puts attacker text into the environment — a web gateway, a mail filter — hands it command execution.",
  "source_type": "cve",
  "severity": "critical",
  "cvss": {
    "score": 9.8,
    "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
    "version": "3.1"
  },
  "epss": 0.99999,
  "exploitation": {
    "known_exploited": true,
    "exploit_available": true,
    "attack_complexity": "low",
    "kev_added": "2022-01-28",
    "prerequisites": "Any path that copies request data into an environment variable"
  },
  "remediation": {
    "patch_available": true
  },
  "mitre_attack": [
    "T1190",
    "T1059"
  ],
  "kill_chain": "execution",
  "recommended_action": "Patch the shell on every host, including containers and appliances, then hunt for requests carrying function definitions in headers.",
  "confidence": "high",
  "provenance": [
    {
      "fields": [
        "cvss",
        "exploitation.attack_complexity",
        "exploitation.exploit_available",
        "references",
        "published_at"
      ],
      "source": "https://nvd.nist.gov/vuln/detail/CVE-2014-6271",
      "retrieved_at": "2026-08-07T16:48:34.775Z",
      "confidence": "high",
      "extractor": "scrty-crds-pipeline/0.1"
    },
    {
      "fields": [
        "exploitation.known_exploited",
        "exploitation.kev_added"
      ],
      "source": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "retrieved_at": "2026-08-07T16:48:34.775Z",
      "confidence": "high",
      "extractor": "scrty-crds-pipeline/0.1"
    },
    {
      "fields": [
        "epss"
      ],
      "source": "https://api.first.org/data/v1/epss?cve=CVE-2014-6271",
      "retrieved_at": "2026-08-07T16:48:34.775Z",
      "confidence": "high",
      "extractor": "scrty-crds-pipeline/0.1"
    },
    {
      "fields": [
        "title",
        "summary",
        "severity",
        "remediation",
        "mitre_attack",
        "kill_chain",
        "recommended_action",
        "confidence",
        "tags",
        "exploitation.prerequisites"
      ],
      "source": "https://nvd.nist.gov/vuln/detail/CVE-2014-6271",
      "retrieved_at": "2026-08-07T16:48:34.775Z",
      "confidence": "high",
      "extractor": "claude-code"
    }
  ],
  "references": [
    {
      "type": "cve",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2014-6271",
      "label": "NVD record"
    },
    {
      "type": "cisa",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "label": "CISA Known Exploited Vulnerabilities catalog"
    },
    {
      "type": "vendor_advisory",
      "url": "http://jvn.jp/en/jp/JVN55667175/index.html"
    },
    {
      "type": "vendor_advisory",
      "url": "http://jvndb.jvn.jp/jvndb/JVNDB-2014-000126"
    },
    {
      "type": "vendor_advisory",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1141597"
    }
  ],
  "published_at": "2014-09-24T18:48:04.477Z",
  "issued_at": "2026-08-07T16:48:34.775Z",
  "tags": [
    "bash",
    "unix",
    "command-injection"
  ]
}