{
  "crds_version": "0.1",
  "kind": "base",
  "id": "crds:cve-2021-21311",
  "revision": 1,
  "title": "Adminer — request forgery in the bundled database tool",
  "summary": "Adminer 4.0.0 through 4.7.8, in the single-file build that bundles every driver, lets an attacker make the server issue requests of their choosing and read back whatever it finds.",
  "source_type": "cve",
  "severity": "high",
  "cvss": {
    "score": 7.2,
    "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N",
    "version": "3.1"
  },
  "epss": 0.90461,
  "exploitation": {
    "known_exploited": true,
    "exploit_available": true,
    "attack_complexity": "low",
    "kev_added": "2025-09-29",
    "prerequisites": "Network access to the Adminer page; no credentials needed."
  },
  "remediation": {
    "patch_available": true,
    "fixed_in": [
      "Adminer 4.7.9"
    ]
  },
  "mitre_attack": [
    "T1190"
  ],
  "kill_chain": "initial_access",
  "recommended_action": "Upgrade Adminer to 4.7.9 or later, or take it out of production entirely — it is an administration tool that rarely belongs on a public host.",
  "confidence": "high",
  "provenance": [
    {
      "fields": [
        "cvss",
        "exploitation.attack_complexity",
        "exploitation.exploit_available",
        "references",
        "published_at"
      ],
      "source": "https://nvd.nist.gov/vuln/detail/CVE-2021-21311",
      "retrieved_at": "2026-09-24T08:51:39.744Z",
      "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": "2026-09-24T08:51:39.744Z",
      "confidence": "high",
      "extractor": "scrty-crds-pipeline/0.1"
    },
    {
      "fields": [
        "epss"
      ],
      "source": "https://api.first.org/data/v1/epss?cve=CVE-2021-21311",
      "retrieved_at": "2026-09-24T08:51:39.744Z",
      "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-2021-21311",
      "retrieved_at": "2026-09-24T08:51:39.744Z",
      "confidence": "high",
      "extractor": "claude-code"
    }
  ],
  "references": [
    {
      "type": "cve",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-21311",
      "label": "NVD record"
    },
    {
      "type": "cisa",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "label": "CISA Known Exploited Vulnerabilities catalog"
    },
    {
      "type": "vendor_advisory",
      "url": "https://github.com/vrana/adminer/commit/ccd2374b0b12bd547417bf0dacdf153826c83351"
    },
    {
      "type": "vendor_advisory",
      "url": "https://github.com/vrana/adminer/security/advisories/GHSA-x5r2-hj5c-8jx6"
    },
    {
      "type": "exploit",
      "url": "https://github.com/vrana/adminer/files/5957311/Adminer.SSRF.pdf"
    }
  ],
  "published_at": "2021-02-11T21:15:13.820Z",
  "issued_at": "2026-09-24T08:51:39.744Z",
  "tags": [
    "adminer",
    "database",
    "ssrf",
    "kev"
  ]
}