CVE-2021-26432CriticalCVSS 9.8

Windows Services for NFS ONCRPC XDR Driver Remote Code Execution Vulnerability

Published
August 10, 2021
Last Modified
—

🔗 CVE IDs covered (1)

CVE-2021-26432 →

📋 Description

What system configurations would expose this vulnerability? Servers that have installed the Network File System are exposed to this vulnerability in rpcxdr.sys. An attacker would require read or write permission to any file on an NFS share on the victim system. If NFS is configured to allow anonymous access, then the victim system would be vulnerable to unauthenticated attackers. Does this security update apply to non-server systems? Yes. While servers are much more likely to be exposed to this vulnerability, the security update to rpcxdr.sys applies to all Windows editions in the Security Updates table.

🎯 Affected products31

  • Windows 10 Version 1607 for 32-bit Systems
  • Windows 10 Version 1607 for x64-based Systems
  • Windows 10 Version 1809 for 32-bit Systems
  • Windows 10 Version 1809 for ARM64-based Systems
  • Windows 10 Version 1809 for x64-based Systems
  • Windows 10 Version 1909 for 32-bit Systems
  • Windows 10 Version 1909 for ARM64-based Systems
  • Windows 10 Version 1909 for x64-based Systems
  • Windows 10 Version 2004 for 32-bit Systems
  • Windows 10 Version 2004 for ARM64-based Systems
  • Windows 10 Version 2004 for x64-based Systems
  • Windows 10 Version 20H2 for 32-bit Systems
  • Windows 10 Version 20H2 for ARM64-based Systems
  • Windows 10 Version 21H1 for 32-bit Systems
  • Windows 10 Version 21H1 for ARM64-based Systems
  • Windows 10 Version 21H1 for x64-based Systems
  • Windows 10 for 32-bit Systems
  • Windows 10 for x64-based Systems
  • Windows 8.1 for 32-bit systems
  • Windows 8.1 for x64-based systems
  • Windows RT 8.1
  • Windows Server 2012
  • Windows Server 2012 (Server Core installation)
  • Windows Server 2012 R2
  • Windows Server 2012 R2 (Server Core installation)
  • Windows Server 2016
  • Windows Server 2016 (Server Core installation)
  • Windows Server 2019
  • Windows Server 2019 (Server Core installation)
  • Windows Server, version 2004 (Server Core installation)
  • +1 more not shown

✅ Remediation

KB5005030 (Security Update) — fixed build 10.0.17763.2114 KB5005031 (Security Update) — fixed build 10.0.18363.1734 KB5005033 (Security Update) — fixed build 10.0.19043.1165 KB5005033 (Security Update) — fixed build 10.0.19041.1165 KB5005033 (Security Update) — fixed build 10.0.19042.1165 KB5005040 (Security Update) — fixed build 10.0.10240.19022 KB5005043 (Security Update) — fixed build 10.0.14393.4583 KB5005076 (Monthly Rollup) — fixed build 6.3.9600.20094 KB5005106 (Security Only) — fixed build 6.3.9600.20094 KB5005099 (Monthly Rollup) — fixed build 6.2.9200.23435 KB5005094 (Security Only) — fixed build 6.2.9200.23435

🔗 References (19)