CVE-2021-26424CriticalCVSS 9.9

Windows TCP/IP Remote Code Execution Vulnerability

Published
August 10, 2021
Last Modified
—

🔗 CVE IDs covered (1)

CVE-2021-26424 →

📋 Description

How could an attacker exploit this vulnerability? This vulnerability is remotely triggerable by a malicious Hyper-V guest that sends an ipv6 ping to the Hyper-V host. An attacker could send a specially crafted TCPIP packet to its host utilizing the TCPIP Protocol Stack (tcpip.sys) to process packets. Is this attack specific to Hyper-V or applicable to all hypervisor technologies? This attack is specific to Hyper-V. Systems that do not have Hyper-V installed are not at risk. Will disabling IPV6 mitigate this vulnerability? Yes. Disabling IPV6 will block the threat vector. See Guidance for configuring IPv6 in Windows for advanced users for instructions for disabling IPV6.

🎯 Affected products39

  • 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 7 for 32-bit Systems Service Pack 1
  • Windows 7 for x64-based Systems Service Pack 1
  • Windows 8.1 for 32-bit systems
  • Windows 8.1 for x64-based systems
  • Windows RT 8.1
  • Windows Server 2008 R2 for x64-based Systems Service Pack 1
  • Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
  • Windows Server 2008 for 32-bit Systems Service Pack 2
  • Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)
  • Windows Server 2008 for x64-based Systems Service Pack 2
  • Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)
  • Windows Server 2012
  • +9 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 KB5005088 (Monthly Rollup) — fixed build 6.1.7601.25685 KB5005089 (Security Only) — fixed build 6.1.7601.25685 KB5005076 (Monthly Rollup) — fixed build 6.3.9600.20094 KB5005106 (Security Only) — fixed build 6.3.9600.20094 KB5005090 (Monthly Rollup) — fixed build 6.0.6003.21192 KB5005095 (Security Only) — fixed build 6.0.6003.21192 KB5005099 (Monthly Rollup) — fixed build 6.2.9200.23435 KB5005094 (Security Only) — fixed build 6.2.9200.23435

🔗 References (27)