VDB
msrc_CVE-2026-20817
msrc_CVE-2026-20817
PUBLISHED
CVSS 7.800000190734863 HIGH
Risk Scores
CVSS 3.1
7.800000190734863
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Windows Server 2022 10.0.20348.4648 | ||
| Windows Server 2025 (Server Core installation) <10.0.26100.32230 | ||
| Windows 10 Version 21H2 for 32-bit Systems 10.0.19044.6809 | ||
| Windows 10 Version 22H2 for 32-bit Systems 10.0.19045.6809 | ||
| Windows 10 Version 22H2 for x64-based Systems <10.0.19045.6809 | ||
| Windows 10 Version 22H2 for x64-based Systems 10.0.19045.6809 | ||
| Windows 11 Version 25H2 for ARM64-based Systems 10.0.26200.7623 | ||
| Windows 10 Version 21H2 for ARM64-based Systems 10.0.19044.6809 | ||
| Windows Server 2022 (Server Core installation) 10.0.20348.4648 | ||
| Windows Server 2022 <10.0.20348.4648 | ||
| Windows 10 Version 22H2 for ARM64-based Systems 10.0.19045.6809 | ||
| Windows 10 Version 21H2 for x64-based Systems <10.0.19044.6809 | ||
| Windows 10 Version 22H2 for 32-bit Systems <10.0.19045.6809 | ||
| Windows 11 Version 25H2 for ARM64-based Systems <10.0.26200.7623 | ||
| Windows 10 Version 21H2 for 32-bit Systems <10.0.19044.6809 | ||
| Windows 10 Version 21H2 for x64-based Systems 10.0.19044.6809 | ||
| Windows 10 Version 22H2 for ARM64-based Systems <10.0.19045.6809 | ||
| Windows Server 2022 (Server Core installation) <10.0.20348.4648 | ||
| Windows 10 Version 21H2 for ARM64-based Systems <10.0.19044.6809 | ||
| Windows Server 2025 (Server Core installation) 10.0.26100.32230 |
Timeline
- Jan 13, 2026 CVE Published
- Sep 7, 2026 Security Advisory
- Sep 7, 2026 Security Advisory
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20817 advisory
- https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-20817.json advisory
- https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1 url
- https://support.microsoft.com/lifecycle url
- https://www.first.org/cvss url
- https://support.microsoft.com/help/5073457 fix
- https://support.microsoft.com/help/5073724 fix
- https://support.microsoft.com/en-us/topic/a6021fd2-b3b7-45a7-b68e-35c28a2a77da fix
- https://support.microsoft.com/help/5074109 fix
- https://support.microsoft.com/help/5073455 fix
- https://support.microsoft.com/help/5073450 fix