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CVE-2022-21979: Microsoft Exchange Server Information Disclosure Vulnerability

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-08-09 · updated 2026-06-17

Description

Microsoft Exchange Server Information Disclosure Vulnerability

Affected products

• Microsoft Exchange Server: 2013-cumulative_update_11, 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 15.00.1497.042 — fixed in 15.00.1497.042
• Microsoft Exchange Server 2016 Cumulative Update 22: from 15.0.0 before 15.01.2375.032 — fixed in 15.01.2375.032
• Microsoft Exchange Server 2016 Cumulative Update 23: from 15.01.0 before 15.01.2507.013 — fixed in 15.01.2507.013
• Microsoft Exchange Server 2019 Cumulative Update 11: from 15.02.0 before 15.02.0986.030 — fixed in 15.02.0986.030
• Microsoft Exchange Server 2019 Cumulative Update 12: from 15.02.0 before 15.02.1118.015 — fixed in 15.02.1118.015

How to fix

Upgrade to a fixed version: Microsoft Exchange Server 2013 Cumulative Update 23 15.00.1497.042; Microsoft Exchange Server 2016 Cumulative Update 22 15.01.2375.032; Microsoft Exchange Server 2016 Cumulative Update 23 15.01.2507.013; Microsoft Exchange Server 2019 Cumulative Update 11 15.02.0986.030; Microsoft Exchange Server 2019 Cumulative Update 12 15.02.1118.015. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-21979
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-21979

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