Firetruck

CVE-2021-33766

KEV
Updated Aug 10, 2026 · PUBLISHED
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Description

Microsoft Exchange Server contains an information disclosure vulnerability which can allow an unauthenticated attacker to steal email traffic from target.

Full record on cve.org →

Affected packages

PackageVendor / ProductVersion rangeStatus
Microsoft Exchange Server 2013 Cumulative Update 23Microsoft / Microsoft Exchange Server 2013 Cumulative Update 23>= 15.00.0, < 15.00.1497.015affected
Microsoft Exchange Server 2016 Cumulative Update 19Microsoft / Microsoft Exchange Server 2016 Cumulative Update 19>= 15.01.0, < 15.01.2176.012affected
Microsoft Exchange Server 2016 Cumulative Update 20Microsoft / Microsoft Exchange Server 2016 Cumulative Update 20>= 15.01.0, < 15.01.2242.008affected
Microsoft Exchange Server 2019 Cumulative Update 8Microsoft / Microsoft Exchange Server 2019 Cumulative Update 8>= 15.02.0, < 15.02.0792.013affected
Microsoft Exchange Server 2019 Cumulative Update 9Microsoft / Microsoft Exchange Server 2019 Cumulative Update 9>= 15.02.0, < 15.02.0858.010affected