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CVE-2023-36778: Microsoft Exchange Server Remote Code Execution Vulnerability

• Severity: high (CVSS 8.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-10-10 · updated 2026-06-17
• Weakness: CWE-426

Description

Microsoft Exchange Server Remote Code Execution Vulnerability

Affected products

• Microsoft Exchange Server: 2016-cumulative_update_23, 2019-cumulative_update_12, 2019-cumulative_update_13
• Microsoft Exchange Server 2016 Cumulative Update 23: from 15.01.0 before 15.01.2507.034 — fixed in 15.01.2507.034
• Microsoft Exchange Server 2019 Cumulative Update 12: from 15.02.0 before 15.02.1118.039 — fixed in 15.02.1118.039
• Microsoft Exchange Server 2019 Cumulative Update 13: from 15.02.0 before 15.02.1258.027 — fixed in 15.02.1258.027

How to fix

Upgrade to a fixed version: Microsoft Exchange Server 2016 Cumulative Update 23 15.01.2507.034; Microsoft Exchange Server 2019 Cumulative Update 12 15.02.1118.039; Microsoft Exchange Server 2019 Cumulative Update 13 15.02.1258.027. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-36778
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-36778

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