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CVE-2022-41040: Microsoft Exchange Server Elevation of Privilege Vulnerability

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2022-09-30
• EPSS: 100.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-10-03 · updated 2026-06-17
• Weakness: CWE-918

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 15.00.1497.044 — fixed in 15.00.1497.044
• Microsoft Exchange Server 2016 Cumulative Update 22: from 15.0.0 before 15.01.2375.037 — fixed in 15.01.2375.037
• Microsoft Exchange Server 2016 Cumulative Update 23: from 15.01.0 before 15.01.2507.016 — fixed in 15.01.2507.016
• Microsoft Exchange Server 2019 Cumulative Update 11: from 15.02.0 before 15.02.0986.036 — fixed in 15.02.0986.036
• Microsoft Exchange Server 2019 Cumulative Update 12: from 15.02.0 before 15.02.1118.020 — fixed in 15.02.1118.020

How to fix

Upgrade to a fixed version: Microsoft Exchange Server 2013 Cumulative Update 23 15.00.1497.044; Microsoft Exchange Server 2016 Cumulative Update 22 15.01.2375.037; Microsoft Exchange Server 2016 Cumulative Update 23 15.01.2507.016; Microsoft Exchange Server 2019 Cumulative Update 11 15.02.0986.036; Microsoft Exchange Server 2019 Cumulative Update 12 15.02.1118.020. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-41040
• http://packetstormsecurity.com/files/170066/Microsoft-Exchange-ProxyNotShell-Remote-Code-Execution.html
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2022-41040
• https://www.kb.cert.org/vuls/id/915563
• https://www.secpod.com/blog/microsoft-november-2022-patch-tuesday-patches-65-vulnerabilities-including-6-zero-days/
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-41040

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