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High7.5Microsoft Server

High [CVE-2021-26433] Windows Services for NFS ONCRPC XDR Driver Information Disclosure Vulnerability

This high-severity Microsoft Server advisory covers CVE-2021-26433 affecting Windows Server 2012 (Server Core installation), Windows Server 2012 R2 (Server Core installation), Windows Server 2016 (Server Core installation).

CVE-2021-26433 Published Aug 12, 2021Updated by vendor Aug 10, 2026
CVE-2021-26433
Affected products & platforms
Microsoft ServerWindows Server
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Summary

Windows Services for NFS ONCRPC XDR Driver Information Disclosure Vulnerability

Affected products named by the advisory: Windows Server 2012; Windows Server 2012 (Server Core installation); Windows Server 2012 R2; Windows Server 2012 R2 (Server Core installation); and 6 more.

Affected products named by the advisory: Windows Server 2016 (Server Core installation); Windows Server 2019 (Server Core installation); Windows Server version 2004; Windows Server version 20H2.

Affected versions
  • Windows 10 Version 1507 10.0.10240.0 before 10.0.10240.19022
  • Windows 10 Version 1607 10.0.14393.0 before 10.0.14393.4583
  • Windows 10 Version 1809 10.0.17763.0 before 10.0.17763.2114
  • Windows 10 Version 1809 10.0.0 before 10.0.17763.2114
  • Windows 10 Version 1909 10.0.0 before 10.0.18363.1734
  • Windows 10 Version 2004 10.0.0 before 10.0.19041.1165
  • Windows 10 Version 20H2 10.0.0 before 10.0.19042.1165
  • Windows 10 Version 21H1 10.0.0 before 10.0.19043.1165
  • Windows 8.1 6.3.0 before 6.3.9600.20094
  • Windows Server 2012 6.2.9200.0 before 6.2.9200.23435
  • Windows Server 2012 (Server Core installation) 6.2.9200.0 before 6.2.9200.23435
  • Windows Server 2012 R2 6.3.9600.0 before 6.3.9600.20094

Official advisory · high-confidence parse· fetched 2 hours ago·verify at source

Fixed versions
  • 10.0.10240.19022
  • 10.0.14393.4583
  • 10.0.17763.2114
  • 10.0.18363.1734
  • 10.0.19041.1165
  • 10.0.19042.1165
  • 10.0.19043.1165
  • 6.3.9600.20094
  • 6.2.9200.23435

Official advisory · high-confidence parse· fetched 2 hours ago·verify at source

Mitigation

Upgrade to a fixed release: 10.0.10240.19022, 10.0.14393.4583, 10.0.17763.2114, 10.0.18363.1734, 10.0.19041.1165, 10.0.19042.1165. That is the remediation for this advisory.

The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.

Official advisory · high-confidence parse· fetched 2 hours ago·verify at source

Discussion(0)

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