Microsoft Windows 10 21H2 vulnerabilities

CVE-2026-40407 [HIGH] CWE-122 CVE-2026-40407: 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.

CVE-2026-34351 [HIGH] CWE-362 CVE-2026-34351: Concurrent execution using shared resource with improper synchronization ('race condition') in Windo Concurrent execution using shared resource with improper synchronization ('race condition') in Windows TCP/IP allows an authorized attacker to elevate privileges locally.

CVE-2026-35417 [HIGH] CWE-843 CVE-2026-35417: Use after free in Windows Win32K - GRFX allows an authorized attacker to elevate privileges locally. Use after free in Windows Win32K - GRFX allows an authorized attacker to elevate privileges locally.

CVE-2026-42825 [HIGH] CWE-416 CVE-2026-42825: Use after free in Windows Telephony Service allows an authorized attacker to elevate privileges loca Use after free in Windows Telephony Service allows an authorized attacker to elevate privileges locally.

CVE-2026-34337 [HIGH] CWE-362 CVE-2026-34337: Use after free in Windows Cloud Files Mini Filter Driver allows an authorized attacker to elevate pr Use after free in Windows Cloud Files Mini Filter Driver allows an authorized attacker to elevate privileges locally.

CVE-2026-35422 [MEDIUM] CWE-288 CVE-2026-35422: Authentication bypass using an alternate path or channel in Windows TCP/IP allows an authorized atta Authentication bypass using an alternate path or channel in Windows TCP/IP allows an authorized attacker to bypass a security feature over a network.

CVE-2026-34339 [MEDIUM] CWE-476 CVE-2026-34339: Null pointer dereference in Windows LDAP - Lightweight Directory Access Protocol allows an authorize Null pointer dereference in Windows LDAP - Lightweight Directory Access Protocol allows an authorized attacker to deny service locally.

CVE-2026-32170 [MEDIUM] CWE-415 CVE-2026-32170: Double free in Windows Rich Text Edit allows an authorized attacker to elevate privileges locally. Double free in Windows Rich Text Edit allows an authorized attacker to elevate privileges locally.

CVE-2026-32209 [MEDIUM] CWE-284 CVE-2026-32209: Improper access control in Windows Filtering Platform (WFP) allows an authorized attacker to bypass Improper access control in Windows Filtering Platform (WFP) allows an authorized attacker to bypass a security feature locally.

CVE-2026-35423 [MEDIUM] CWE-125 CVE-2026-35423: Out-of-bounds read in Telnet Client allows an unauthorized attacker to disclose information over a n Out-of-bounds read in Telnet Client allows an unauthorized attacker to disclose information over a network.

CVE-2026-40380 [MEDIUM] CWE-122 CVE-2026-40380: Heap-based buffer overflow in Volume Manager Extension Driver allows an authorized attacker to execu Heap-based buffer overflow in Volume Manager Extension Driver allows an authorized attacker to execute code with a physical attack.

CVE-2026-21530 [MEDIUM] CWE-415 CVE-2026-21530: Double free in Windows Rich Text Edit allows an authorized attacker to elevate privileges locally. Double free in Windows Rich Text Edit allows an authorized attacker to elevate privileges locally.

CVE-2026-41097 [MEDIUM] CWE-1329 CVE-2026-41097: Reliance on a component that is not updateable in Windows Secure Boot allows an authorized attacker Reliance on a component that is not updateable in Windows Secure Boot allows an authorized attacker to bypass a security feature locally.

CVE-2026-32183 [HIGH] CWE-77 CVE-2026-32183: Improper neutralization of special elements used in a command ('command injection') in Windows Snipp Improper neutralization of special elements used in a command ('command injection') in Windows Snipping Tool allows an unauthorized attacker to execute code locally.

CVE-2026-26177 [HIGH] CWE-416 CVE-2026-26177: Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to ele Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

CVE-2026-32070 [HIGH] CWE-416 CVE-2026-32070: Use after free in Windows Common Log File System Driver allows an authorized attacker to elevate pri Use after free in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.

CVE-2026-32164 [HIGH] CWE-362 CVE-2026-32164: Concurrent execution using shared resource with improper synchronization ('race condition') in Windo Concurrent execution using shared resource with improper synchronization ('race condition') in Windows User Interface Core allows an authorized attacker to elevate privileges locally.

CVE-2026-32149 [HIGH] CWE-20 CVE-2026-32149: Improper input validation in Windows Hyper-V allows an authorized attacker to execute code locally. Improper input validation in Windows Hyper-V allows an authorized attacker to execute code locally.

CVE-2026-20930 [HIGH] CWE-362 CVE-2026-20930: 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.

CVE-2026-32068 [HIGH] CWE-362 CVE-2026-32068: Concurrent execution using shared resource with improper synchronization ('race condition') in Windo Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SSDP Service allows an authorized attacker to elevate privileges locally.