CVE-2023-21800: Windows Installer Elevation of Privilege Vulnerability

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% 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-73

Description

Windows Installer Elevation of Privilege Vulnerability

Affected products

Microsoft Windows Server 2008: r2-sp1
Microsoft Windows Server 2008 R2 Service Pack 1: from 6.1.7601.0 before 6.1.7601.26366 — fixed in 6.1.7601.26366
Microsoft Windows Server 2008 Service Pack 2: from 6.0.6003.0 before 6.0.6003.21915 — fixed in 6.0.6003.21915

How to fix

Upgrade to a fixed version: Microsoft Windows Server 2008 R2 Service Pack 1 6.1.7601.26366; Microsoft Windows Server 2008 Service Pack 2 6.0.6003.21915. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21800
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21800

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