{"id":"CVE-2021-33766","aliases":[],"url":"https://o3.security/vulnerability/CVE-2021-33766","summary":"Microsoft Exchange Server Information Disclosure Vulnerability","details":"Microsoft Exchange Server Information Disclosure Vulnerability","published":"2021-07-14T18:15:10.380","modified":"2026-08-10T19:58:44.540","cvss":{"score":7.3,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"},"epss":{"score":0.98136,"percentile":0.9991,"asOf":"2026-09-08"},"cisaKev":null,"exploitsKnown":8,"affectedPackages":[],"fix":null,"references":[{"type":"FIX","url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-33766"},{"type":"FIX","url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33766"},{"type":"ADVISORY","url":"https://www.zerodayinitiative.com/advisories/ZDI-21-798/"},{"type":"WEB","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-33766"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-08-10T19:58:44.540"}}