CVE-2023-21778: Microsoft Dynamics Unified Service Desk Remote Code Execution Vulnerability

Severity: high (CVSS 8.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-02-14 · updated 2026-08-19
Weakness: CWE-77

Description

Microsoft Dynamics Unified Service Desk Remote Code Execution Vulnerability

Affected products

Microsoft Dynamics 365 (on-premises) version 9.0: before 4.2.0.51 — fixed in 4.2.0.51
Microsoft Dynamics 365 (on-premises) version 9.0: from 4.2.0 before 4.2.0.51 — fixed in 4.2.0.51

How to fix

Upgrade to a fixed version: Microsoft Dynamics 365 (on-premises) version 9.0 4.2.0.51; Microsoft Dynamics 365 (on-premises) version 9.0 4.2.0.51. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21778
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21778

Get alerted when CVE-2023-21778 or the next vulnerability affects your stack