CVE-2021-33766

Microsoft Exchange Server Information Disclosure Vulnerability

CVE-2021-33766 is fixed in 5 products on 1 platform, first by KB5001779, released April 13, 2021. It is being exploited: CISA added it to the Known Exploited Vulnerabilities catalog on January 18, 2022. Patch Radar priority: Patch now.

Patch nowCISA KEV

CVSS

7.3

Important

Exploitation

Exploited

Listed by CISA

CISA KEV

Jan 18, 2022

Federal due date Feb 1, 2022

EPSS

0.9818

99th percentile

Where it's fixed

Product	Fix	Released
Microsoft
Microsoft Exchange Server 2013 Cumulative Update 23	KB5001779	Apr 13, 2021
Microsoft Exchange Server 2016 Cumulative Update 19	KB5001779	Apr 13, 2021
Microsoft Exchange Server 2016 Cumulative Update 20	KB5001779	Apr 13, 2021
Microsoft Exchange Server 2019 Cumulative Update 8	KB5001779	Apr 13, 2021
Microsoft Exchange Server 2019 Cumulative Update 9	KB5001779	Apr 13, 2021

Details

Published
July 13, 2021
CISA required action
Apply updates per vendor instructions.
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-33766

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