CVEDB API

Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-21245

Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally.

Exploit prediction scoring system (EPSS) score

EPSS Score 0.0

EPSS Ranking 7.1%

CVSS Severity

CVSS v3 Score 7.8

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21245

Products affected by CVE-2026-21245

Microsoft » Windows 11 24h2 » Version: N/A

cpe:2.3:o:microsoft:windows_11_24h2:-
Microsoft » Windows 11 24h2 » Version: 10.0.26100.1742

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.1742
Microsoft » Windows 11 24h2 » Version: 10.0.26100.2033

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.2033
Microsoft » Windows 11 24h2 » Version: 10.0.26100.2161

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.2161
Microsoft » Windows 11 24h2 » Version: 10.0.26100.2314

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.2314
Microsoft » Windows 11 24h2 » Version: 10.0.26100.2454

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.2454
Microsoft » Windows 11 24h2 » Version: 10.0.26100.2605

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.2605
Microsoft » Windows 11 24h2 » Version: 10.0.26100.2894

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.2894
Microsoft » Windows 11 24h2 » Version: 10.0.26100.3107

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.3107
Microsoft » Windows 11 24h2 » Version: 10.0.26100.3194

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.3194
Microsoft » Windows 11 24h2 » Version: 10.0.26100.3403

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.3403
Microsoft » Windows 11 24h2 » Version: 10.0.26100.3476

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.3476
Microsoft » Windows 11 24h2 » Version: 10.0.26100.3775

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.3775
Microsoft » Windows 11 24h2 » Version: 10.0.26100.3981

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.3981
Microsoft » Windows 11 24h2 » Version: 10.0.26100.4061

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.4061
Microsoft » Windows 11 24h2 » Version: 10.0.26100.4270

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.4270
Microsoft » Windows 11 24h2 » Version: 10.0.26100.4349

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.4349
Microsoft » Windows 11 24h2 » Version: 10.0.26100.4652

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.4652
Microsoft » Windows 11 24h2 » Version: 10.0.26100.4851

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.4851
Microsoft » Windows 11 24h2 » Version: 10.0.26100.4946

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.4946
Microsoft » Windows 11 24h2 » Version: 10.0.26100.6508

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.6508
Microsoft » Windows 11 24h2 » Version: 10.0.26100.6563

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.6563
Microsoft » Windows 11 24h2 » Version: 10.0.26100.6584

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.6584
Microsoft » Windows 11 24h2 » Version: 10.0.26100.6899

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.6899
Microsoft » Windows 11 24h2 » Version: 10.0.26100.7092

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.7092
Microsoft » Windows 11 24h2 » Version: 10.0.26100.7171

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.7171
Microsoft » Windows 11 24h2 » Version: 10.0.26100.7392

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.7392
Microsoft » Windows 11 24h2 » Version: 10.0.26100.7456

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.7456
Microsoft » Windows 11 24h2 » Version: 10.0.26100.7462

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.7462
Microsoft » Windows 11 24h2 » Version: 10.0.26100.7623

cpe:2.3:o:microsoft:windows_11_24h2:10.0.26100.7623
Microsoft » Windows 11 25h2 » Version: N/A

cpe:2.3:o:microsoft:windows_11_25h2:-
Microsoft » Windows 11 25h2 » Version: 10.0.26200.6899

cpe:2.3:o:microsoft:windows_11_25h2:10.0.26200.6899
Microsoft » Windows 11 25h2 » Version: 10.0.26200.7092

cpe:2.3:o:microsoft:windows_11_25h2:10.0.26200.7092
Microsoft » Windows 11 25h2 » Version: 10.0.26200.7171

cpe:2.3:o:microsoft:windows_11_25h2:10.0.26200.7171
Microsoft » Windows 11 25h2 » Version: 10.0.26200.7392

cpe:2.3:o:microsoft:windows_11_25h2:10.0.26200.7392
Microsoft » Windows 11 25h2 » Version: 10.0.26200.7456

cpe:2.3:o:microsoft:windows_11_25h2:10.0.26200.7456
Microsoft » Windows 11 25h2 » Version: 10.0.26200.7462

cpe:2.3:o:microsoft:windows_11_25h2:10.0.26200.7462
Microsoft » Windows 11 25h2 » Version: 10.0.26200.7623

cpe:2.3:o:microsoft:windows_11_25h2:10.0.26200.7623
Microsoft » Windows Server 2025 » Version: N/A

cpe:2.3:o:microsoft:windows_server_2025:-
Microsoft » Windows Server 2025 » Version: 10.0.26100.2033

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.2033
Microsoft » Windows Server 2025 » Version: 10.0.26100.2314

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.2314
Microsoft » Windows Server 2025 » Version: 10.0.26100.2605

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.2605
Microsoft » Windows Server 2025 » Version: 10.0.26100.2894

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.2894
Microsoft » Windows Server 2025 » Version: 10.0.26100.3107

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.3107
Microsoft » Windows Server 2025 » Version: 10.0.26100.3194

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.3194
Microsoft » Windows Server 2025 » Version: 10.0.26100.32230

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.32230
Microsoft » Windows Server 2025 » Version: 10.0.26100.3403

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.3403
Microsoft » Windows Server 2025 » Version: 10.0.26100.3476

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.3476
Microsoft » Windows Server 2025 » Version: 10.0.26100.3775

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.3775
Microsoft » Windows Server 2025 » Version: 10.0.26100.3781

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.3781
Microsoft » Windows Server 2025 » Version: 10.0.26100.3981

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.3981
Microsoft » Windows Server 2025 » Version: 10.0.26100.4061

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.4061
Microsoft » Windows Server 2025 » Version: 10.0.26100.4066

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.4066
Microsoft » Windows Server 2025 » Version: 10.0.26100.4270

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.4270
Microsoft » Windows Server 2025 » Version: 10.0.26100.4349

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.4349
Microsoft » Windows Server 2025 » Version: 10.0.26100.4652

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.4652
Microsoft » Windows Server 2025 » Version: 10.0.26100.4656

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.4656
Microsoft » Windows Server 2025 » Version: 10.0.26100.4851

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.4851
Microsoft » Windows Server 2025 » Version: 10.0.26100.4946

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.4946
Microsoft » Windows Server 2025 » Version: 10.0.26100.6508

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.6508
Microsoft » Windows Server 2025 » Version: 10.0.26100.6563

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.6563
Microsoft » Windows Server 2025 » Version: 10.0.26100.6584

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.6584
Microsoft » Windows Server 2025 » Version: 10.0.26100.6899

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.6899
Microsoft » Windows Server 2025 » Version: 10.0.26100.6905

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.6905
Microsoft » Windows Server 2025 » Version: 10.0.26100.7092

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.7092
Microsoft » Windows Server 2025 » Version: 10.0.26100.7171

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.7171
Microsoft » Windows Server 2025 » Version: 10.0.26100.7392

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.7392
Microsoft » Windows Server 2025 » Version: 10.0.26100.7456

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.7456
Microsoft » Windows Server 2025 » Version: 10.0.26100.7462

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.7462
Microsoft » Windows Server 2025 » Version: 10.0.26100.7623

cpe:2.3:o:microsoft:windows_server_2025:10.0.26100.7623

Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-21245

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