What’s Vulnerable › Vulnerabilities

CVE-2021-27091: RPC Endpoint Mapper Service Elevation of Privilege Vulnerability

• Severity: medium (CVSS 4.6 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-04-13 · updated 2026-06-17

Description

RPC Endpoint Mapper Service Elevation of Privilege Vulnerability

Affected products

• Microsoft Windows 7: all versions
• Microsoft Windows Server 2008: r2-sp1
• Microsoft Windows Server 2012: all versions
• Microsoft Windows 7: from 6.1.0 before publication — fixed in publication
• Microsoft Windows 7 Service Pack 1: from 6.1.0 before publication — fixed in publication
• Microsoft Windows Server 2008 R2 Service Pack 1: from 6.1.0 before publication — fixed in publication
• Microsoft Windows Server 2012: from 6.2.0 before publication — fixed in publication

How to fix

Upgrade to a fixed version: Microsoft Windows 7 publication; Microsoft Windows 7 Service Pack 1 publication; Microsoft Windows Server 2008 R2 Service Pack 1 publication; Microsoft Windows Server 2012 publication. Check the vendor advisory for mitigations.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-27091
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-27091

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