CVE-2025-21241: Microsoft Windows 10 1507

High severity, CVSS 8.8. EPSS: 1.5% chance of exploitation in the next 30 days.

Windows Telephony Service Remote Code Execution Vulnerability

Affected products

• Microsoft Windows 10 1507: before 10.0.10240.20890 (fixed in 10.0.10240.20890)
• Microsoft Windows 10 1607: before 10.0.14393.7699 (fixed in 10.0.14393.7699)
• Microsoft Windows 10 1809: before 10.0.17763.6775 (fixed in 10.0.17763.6775)
• Microsoft Windows 10 21h2: before 10.0.19044.5371 (fixed in 10.0.19044.5371)
• Microsoft Windows 10 22h2: before 10.0.19045.5371 (fixed in 10.0.19045.5371)
• Microsoft Windows 11 22h2: before 10.0.22621.4751 (fixed in 10.0.22621.4751)
• Microsoft Windows 11 23h2: before 10.0.22631.4751 (fixed in 10.0.22631.4751)
• Microsoft Windows 11 24h2: before 10.0.26100.2894 (fixed in 10.0.26100.2894)
• Microsoft Windows Server 2016: before 10.0.14393.7699 (fixed in 10.0.14393.7699)
• Microsoft Windows Server 2019: before 10.0.17763.6775 (fixed in 10.0.17763.6775)
• Microsoft Windows Server 2022: before 10.0.20348.3091 (fixed in 10.0.20348.3091)
• Microsoft Windows Server 2022 23h2: before 10.0.25398.1369 (fixed in 10.0.25398.1369)
• Microsoft Windows Server 2025: before 10.0.26100.2894 (fixed in 10.0.26100.2894)

Published 2025-01-14. Last modified 2026-06-17.