CVE-2021-33766: Microsoft Exchange Server Information Disclosure

High severity, CVSS 7.3. Actively exploited: in CISA KEV since 2022-01-18. EPSS: 98.2% chance of exploitation in the next 30 days.

Microsoft Exchange Server Information Disclosure Vulnerability

Affected products

• Microsoft Exchange Server: version 2013 only; version 2016 only; version 2019 only

Published 2021-07-14. Last modified 2026-08-10.