CVE-2026-21248: high-severity vulnerability in Microsoft Windows 10 Version 1607
Windows Hyper-V Remote Code Execution Vulnerability
Published · Updated
41Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 7.3epss 1.3%
from disclosure to weapon79 days
Published on NVDFeb 10
1st PoC+79d
exploitation probability
1.3%top 30% of all CVEs
observed exploitation
nono source reports it
1 public exploit(s)
Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to execute code locally.
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Affected products
Microsoft · Windows 10 Version 1607Microsoft · Windows 10 Version 1809Microsoft · Windows 10 Version 21H2Microsoft · Windows 10 Version 22H2Microsoft · Windows 11 version 22H3Microsoft · Windows 11 Version 23H2Microsoft · Windows 11 Version 24H2Microsoft · Windows 11 Version 25H2Microsoft · Windows 11 version 26H1Microsoft · Windows Server 2016Microsoft · Windows Server 2016 (Server Core installation)Microsoft · Windows Server 2019Microsoft · Windows Server 2019 (Server Core installation)Microsoft · Windows Server 2022Microsoft · Windows Server 2022, 23H2 Edition (Server Core installation)Microsoft · Windows Server 2025Microsoft · Windows Server 2025 (Server Core installation)public PoCs found — 1
exploitdbwww.exploit-db.com/exploits/52537unverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — Microsoft Windows 10 Version 1607
In the same product, most dangerous first.
CVE-2021-34527HIGHWindows Print Spooler Remote Code Execution VulnerabilityEPSS 99.8%KEVCVE-2024-21412HIGHInternet Shortcut Files Security Feature Bypass VulnerabilityEPSS 99.4%KEVCVE-2022-30190HIGHMicrosoft Windows Support Diagnostic Tool (MSDT) Remote Code Execution VulnerabilityEPSS 99.2%KEVCVE-2023-36884HIGHWindows Search Remote Code Execution VulnerabilityEPSS 98.9%KEVCVE-2021-40444HIGHMicrosoft MSHTML Remote Code Execution VulnerabilityEPSS 97.5%KEVCVE-2023-36025HIGHWindows SmartScreen Security Feature Bypass VulnerabilityEPSS 88.1%KEV