{
  "_links": {
    "capec": {
      "href": "/api/v1/vulnerability/cve-2021-33766/capec"
    },
    "cvss": {
      "href": "/api/v1/vulnerability/cve-2021-33766/cvss"
    },
    "cwe": {
      "href": "/api/v1/vulnerability/cve-2021-33766/cwe"
    },
    "enrichment": {
      "href": "/api/v1/vulnerability/cve-2021-33766/enrichment"
    },
    "gcve": {
      "href": "/api/v1/vulnerability/cve-2021-33766/gcve"
    },
    "self": {
      "href": "/api/v1/vulnerability/cve-2021-33766"
    },
    "sightings": {
      "href": "/api/v1/sightings/cve-2021-33766"
    }
  },
  "enrichments": {
    "cisa-kev": {
      "kev": true
    },
    "epss": {
      "epss": 0.98136,
      "kev": true,
      "percentile": 0.99911
    },
    "nuclei": {
      "nuclei": true,
      "nuclei_template": "http/cves/2021/CVE-2021-33766.yaml",
      "nuclei_template_severity": "high",
      "nuclei_template_yaml": "id: CVE-2021-33766\n\ninfo:\n  name: Microsoft Exchange - Authentication Bypass\n  author: daffainfo\n  severity: high\n  description: |\n    Microsoft Exchange Server Information Disclosure Vulnerability. This vulnerability enables an attacker to bypass authentication and gain access to the Exchange Server's internal.\n  impact: |\n    Unauthenticated attackers can bypass authentication using a SecurityToken cookie, gaining access to Exchange Server's internal API endpoints and sensitive information.\n  remediation: |\n    Apply security updates provided by Microsoft to fix the authentication bypass vulnerability.\n  reference:\n    - https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33766\n    - https://www.zerodayinitiative.com/advisories/ZDI-21-798/\n    - https://github.com/demossl/CVE-2021-33766-ProxyToken\n    - https://nvd.nist.gov/vuln/detail/CVE-2021-33766\n  classification:\n    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L\n    cvss-score: 7.3\n    cve-id: CVE-2021-33766\n    epss-score: 0.98136\n    epss-percentile: 0.99911\n    cwe-id: NVD-CWE-noinfo\n    cpe: cpe:2.3:a:microsoft:exchange_server:*:*:*:*:*:*:*:*\n  metadata:\n    verified: true\n    max-request: 1\n    vendor: microsoft\n    product: exchange_server\n    shodan-query:\n      - vuln:cve-2021-26855\n      - http.favicon.hash:1768726119\n      - http.title:\"outlook\"\n      - cpe:\"cpe:2.3:a:microsoft:exchange_server\"\n    fofa-query:\n      - title=\"outlook\"\n      - icon_hash=1768726119\n    google-query: intitle:\"outlook\"\n  tags: cve,cve2021,microsoft,exchange,auth-bypass,kev,vkev,vuln\n\nvariables:\n  email: \"{{randstr}}@{{rand_base(5)}}.com\"\n\nhttp:\n  - raw:\n      - |\n        GET /ecp/{{email}}/PersonalSettings/HomePage.aspx?showhelp=false HTTP/1.1\n        Host: {{Hostname}}\n        Cookie: SecurityToken=x\n\n    matchers-condition: and\n    matchers:\n      - type: word\n        part: body\n        words:\n          - '<span id=\"msgCode\">403</span>'\n          - 'function signOut() {'\n        condition: and\n\n      - type: word\n        part: header\n        words:\n          - \"Microsoft.Exchange.Data.Storage.ObjectNotFoundException\"\n          - \"X-BEResource=\"\n        condition: and\n\n      - type: status\n        status:\n          - 403\n# digest: 4a0a00473045022047323d921ee71eed88035a81868c42f2b4f50c2aff995bdbaea930066460263b022100e12e296ed6ea177f0cbeddc3b85b53ae1a271cf63f190401a8de603f810bec35:922c64590222798bb761d5b6d8e72950"
    }
  },
  "vuln_id": "cve-2021-33766"
}