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CVE-2022-21978: Microsoft Exchange Server Elevation of Privilege Vulnerability

• Severity: high (CVSS 7.2 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-05-10 · updated 2026-06-17

Description

Microsoft Exchange Server Elevation of Privilege Vulnerability

Affected products

• Microsoft Exchange Server: 2013-cumulative_update_23, 2016-cumulative_update_22, 2016-cumulative_update_23, 2019-cumulative_update_11, 2019-cumulative_update_12
• Microsoft Exchange Server 2013 Cumulative Update 23: from 15.00.0 before 15.00.1497.36 — fixed in 15.00.1497.36
• Microsoft Exchange Server 2016 Cumulative Update 22: from 15.0.0 before 15.01.2375.028 — fixed in 15.01.2375.028
• Microsoft Exchange Server 2016 Cumulative Update 23: from 15.01.0 before 15.01.2507.009 — fixed in 15.01.2507.009
• Microsoft Exchange Server 2019 Cumulative Update 11: from 15.02.0 before 15.02.0986.026 — fixed in 15.02.0986.026
• Microsoft Exchange Server 2019 Cumulative Update 12: from 15.02.0 before 15.02.1118.009 — fixed in 15.02.1118.009

How to fix

Upgrade to a fixed version: Microsoft Exchange Server 2013 Cumulative Update 23 15.00.1497.36; Microsoft Exchange Server 2016 Cumulative Update 22 15.01.2375.028; Microsoft Exchange Server 2016 Cumulative Update 23 15.01.2507.009; Microsoft Exchange Server 2019 Cumulative Update 11 15.02.0986.026; Microsoft Exchange Server 2019 Cumulative Update 12 15.02.1118.009. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-21978
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2022-21978

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