Microsoft Windows 10 Version 21H2 vulnerabilities
2,449 known vulnerabilities affecting microsoft/windows_10_version_21h2.
Total CVEs
2,449
CISA KEV
94
actively exploited
Public exploits
36
Exploited in wild
75
Severity breakdown
CRITICAL60HIGH1758MEDIUM621LOW10
Vulnerabilities
Page 11 of 123
CVE-2026-20857HIGHCVSS 7.8≥ 10.0.19044.0, < 10.0.19044.68092026-01-13
CVE-2026-20857 [HIGH] CWE-822 CVE-2026-20857: Untrusted pointer dereference in Windows Cloud Files Mini Filter Driver allows an authorized attacke
Untrusted pointer dereference in Windows Cloud Files Mini Filter Driver allows an authorized attacker to elevate privileges locally.
cvelistv5nvd
CVE-2026-20921HIGHCVSS 7.5≥ 10.0.19044.0, < 10.0.19044.68092026-01-13
CVE-2026-20921 [HIGH] CWE-362 CVE-2026-20921: Concurrent execution using shared resource with improper synchronization ('race condition') in Windo
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to elevate privileges over a network.
cvelistv5nvd
CVE-2026-20918HIGHCVSS 7.8≥ 10.0.19044.0, < 10.0.19044.68092026-01-13
CVE-2026-20918 [HIGH] CWE-362 CVE-2026-20918: Concurrent execution using shared resource with improper synchronization ('race condition') in Windo
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Management Services allows an authorized attacker to elevate privileges locally.
cvelistv5nvd
CVE-2026-20940HIGHCVSS 7.8≥ 10.0.19044.0, < 10.0.19044.68092026-01-13
CVE-2026-20940 [HIGH] CWE-822 CVE-2026-20940: Heap-based buffer overflow in Windows Cloud Files Mini Filter Driver allows an authorized attacker t
Heap-based buffer overflow in Windows Cloud Files Mini Filter Driver allows an authorized attacker to elevate privileges locally.
cvelistv5nvd
CVE-2026-20831HIGHCVSS 7.0≥ 10.0.19044.0, < 10.0.19044.68092026-01-13
CVE-2026-20831 [HIGH] CWE-367 CVE-2026-20831: Time-of-check time-of-use (toctou) race condition in Windows Ancillary Function Driver for WinSock a
Time-of-check time-of-use (toctou) race condition in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
cvelistv5nvd
CVE-2026-20856HIGHCVSS 8.1≥ 10.0.19044.0, < 10.0.19044.68092026-01-13
CVE-2026-20856 [HIGH] CWE-20 CVE-2026-20856: Improper input validation in Windows Server Update Service allows an unauthorized attacker to execut
Improper input validation in Windows Server Update Service allows an unauthorized attacker to execute code over a network.
cvelistv5nvd
CVE-2026-20922HIGHCVSS 7.8≥ 10.0.19044.0, < 10.0.19044.68092026-01-13
CVE-2026-20922 [HIGH] CWE-122 CVE-2026-20922: Heap-based buffer overflow in Windows NTFS allows an authorized attacker to execute code locally.
Heap-based buffer overflow in Windows NTFS allows an authorized attacker to execute code locally.
cvelistv5nvd
CVE-2026-20810HIGHCVSS 7.8≥ 10.0.19044.0, < 10.0.19044.68092026-01-13
CVE-2026-20810 [HIGH] CWE-590 CVE-2026-20810: Free of memory not on the heap in Windows Ancillary Function Driver for WinSock allows an authorized
Free of memory not on the heap in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
cvelistv5nvd
CVE-2026-20934HIGHCVSS 7.5≥ 10.0.19044.0, < 10.0.19044.68092026-01-13
CVE-2026-20934 [HIGH] CWE-362 CVE-2026-20934: Concurrent execution using shared resource with improper synchronization ('race condition') in Windo
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to elevate privileges over a network.
cvelistv5nvd
CVE-2026-20931HIGHCVSS 8.0≥ 10.0.19044.0, < 10.0.19044.68092026-01-13
CVE-2026-20931 [HIGH] CWE-73 CVE-2026-20931: External control of file name or path in Windows Telephony Service allows an authorized attacker to
External control of file name or path in Windows Telephony Service allows an authorized attacker to elevate privileges over an adjacent network.
cvelistv5nvd
CVE-2026-20814HIGHCVSS 7.0≥ 10.0.19044.0, < 10.0.19044.68092026-01-13
CVE-2026-20814 [HIGH] CWE-362 CVE-2026-20814: Concurrent execution using shared resource with improper synchronization ('race condition') in Graph
Concurrent execution using shared resource with improper synchronization ('race condition') in Graphics Kernel allows an authorized attacker to elevate privileges locally.
cvelistv5nvd
CVE-2026-20924HIGHCVSS 7.8≥ 10.0.19044.0, < 10.0.19044.68092026-01-13
CVE-2026-20924 [HIGH] CWE-362 CVE-2026-20924: Use after free in Windows Management Services allows an authorized attacker to elevate privileges lo
Use after free in Windows Management Services allows an authorized attacker to elevate privileges locally.
cvelistv5nvd
CVE-2026-20809HIGHCVSS 7.8≥ 10.0.19044.0, < 10.0.19044.68092026-01-13
CVE-2026-20809 [HIGH] CWE-122 CVE-2026-20809: Time-of-check time-of-use (toctou) race condition in Windows Kernel Memory allows an authorized atta
Time-of-check time-of-use (toctou) race condition in Windows Kernel Memory allows an authorized attacker to elevate privileges locally.
cvelistv5nvd
CVE-2026-20866HIGHCVSS 7.8≥ 10.0.19044.0, < 10.0.19044.68092026-01-13
CVE-2026-20866 [HIGH] CWE-362 CVE-2026-20866: Concurrent execution using shared resource with improper synchronization ('race condition') in Windo
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Management Services allows an authorized attacker to elevate privileges locally.
cvelistv5nvd
CVE-2026-20923HIGHCVSS 7.8≥ 10.0.19044.0, < 10.0.19044.68092026-01-13
CVE-2026-20923 [HIGH] CWE-416 CVE-2026-20923: Use after free in Windows Management Services allows an authorized attacker to elevate privileges lo
Use after free in Windows Management Services allows an authorized attacker to elevate privileges locally.
cvelistv5nvd
CVE-2026-20871HIGHCVSS 7.8≥ 10.0.19044.0, < 10.0.19044.68092026-01-13
CVE-2026-20871 [HIGH] CWE-416 CVE-2026-20871: Use after free in Desktop Windows Manager allows an authorized attacker to elevate privileges locall
Use after free in Desktop Windows Manager allows an authorized attacker to elevate privileges locally.
cvelistv5nvd
CVE-2026-20868HIGHCVSS 8.8≥ 10.0.19044.0, < 10.0.19044.68092026-01-13
CVE-2026-20868 [HIGH] CWE-122 CVE-2026-20868: Heap-based buffer overflow in Windows Routing and Remote Access Service (RRAS) allows an unauthorize
Heap-based buffer overflow in Windows Routing and Remote Access Service (RRAS) allows an unauthorized attacker to execute code over a network.
cvelistv5nvd
CVE-2026-20929HIGHCVSS 7.5≥ 10.0.19044.0, < 10.0.19044.68092026-01-13
CVE-2026-20929 [HIGH] CWE-284 CVE-2026-20929: Improper access control in Windows HTTP.sys allows an authorized attacker to elevate privileges over
Improper access control in Windows HTTP.sys allows an authorized attacker to elevate privileges over a network.
cvelistv5nvd
CVE-2026-20820HIGHCVSS 7.8≥ 10.0.19044.0, < 10.0.19044.68092026-01-13
CVE-2026-20820 [HIGH] CWE-122 CVE-2026-20820: Heap-based buffer overflow in Windows Common Log File System Driver allows an authorized attacker to
Heap-based buffer overflow in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.
cvelistv5nvd
CVE-2026-20853HIGHCVSS 7.4≥ 10.0.19044.0, < 10.0.19044.68092026-01-13
CVE-2026-20853 [HIGH] CWE-362 CVE-2026-20853: Concurrent execution using shared resource with improper synchronization ('race condition') in Windo
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows WalletService allows an unauthorized attacker to elevate privileges locally.
cvelistv5nvd