{
  "crds_version": "0.1",
  "kind": "base",
  "id": "crds:cve-2020-0688",
  "revision": 1,
  "title": "Microsoft Exchange — Static Key to Code Execution",
  "summary": "Every Microsoft Exchange server shipped with the same built-in secret key, so any user with a mailbox can sign a crafted request and run code on the server with system privileges.",
  "source_type": "cve",
  "severity": "high",
  "cvss": {
    "score": 8.8,
    "vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
    "version": "3.1"
  },
  "epss": 0.99965,
  "exploitation": {
    "known_exploited": true,
    "exploit_available": true,
    "attack_complexity": "low",
    "kev_added": "2021-11-03",
    "prerequisites": "Any valid mailbox account"
  },
  "remediation": {
    "patch_available": true
  },
  "mitre_attack": [
    "T1190"
  ],
  "kill_chain": "privilege_escalation",
  "recommended_action": "Apply Microsoft's cumulative update for Exchange, then rotate the machine keys on every server in the organisation.",
  "confidence": "high",
  "provenance": [
    {
      "fields": [
        "cvss",
        "exploitation.attack_complexity",
        "exploitation.exploit_available",
        "references",
        "published_at"
      ],
      "source": "https://nvd.nist.gov/vuln/detail/CVE-2020-0688",
      "retrieved_at": "2026-08-07T16:10:10.311Z",
      "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": "2026-08-07T16:10:10.311Z",
      "confidence": "high",
      "extractor": "scrty-crds-pipeline/0.1"
    },
    {
      "fields": [
        "epss"
      ],
      "source": "https://api.first.org/data/v1/epss?cve=CVE-2020-0688",
      "retrieved_at": "2026-08-07T16:10:10.311Z",
      "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-2020-0688",
      "retrieved_at": "2026-08-07T16:10:10.311Z",
      "confidence": "high",
      "extractor": "claude-code"
    }
  ],
  "references": [
    {
      "type": "cve",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-0688",
      "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://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0688"
    },
    {
      "type": "exploit",
      "url": "http://packetstormsecurity.com/files/156592/Microsoft-Exchange-2019-15.2.221.12-Remote-Code-Execution.html"
    },
    {
      "type": "exploit",
      "url": "http://packetstormsecurity.com/files/156620/Exchange-Control-Panel-Viewstate-Deserialization.html"
    }
  ],
  "published_at": "2020-02-11T22:15:15.900Z",
  "issued_at": "2026-08-07T16:10:10.311Z",
  "tags": [
    "microsoft-exchange",
    "mail-server",
    "static-key",
    "rce"
  ]
}