CVE-2018-8435
Windows Hyper-V Security Feature Bypass Vulnerability
CVE-2018-8435 is fixed in 9 products on 1 platform, first by KB4457131, released September 11, 2018. It is not reported as exploited. Patch Radar priority: Routine.
Routine
CVSS
4.2
Important
Exploitation
None reported
Exploitation Less Likely
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0136
71st percentile
<p>A security feature bypass vulnerability exists when Windows Hyper-V BIOS loader fails to provide a high-entropy source.</p> <p>To exploit this vulnerability, an attacker would need to reboot a guest virtual machine numerous times until the vulnerability is triggered.</p> <p>The security update addresses the vulnerability by correcting security feature behavior to ensure Windows Hyper-V BIOS loader provides a high-entropy source.</p>
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Microsoft | |||
| Windows 10 Version 1607 for x64-based Systems | 14393.2485 | KB4457131 | Sep 11, 2018 |
| Windows 10 Version 1703 for x64-based Systems | 15063.1324 | KB4457138 | Sep 11, 2018 |
| Windows 10 Version 1709 for x64-based Systems | 16299.665 | KB4457142 | Sep 11, 2018 |
| Windows 10 Version 1803 for x64-based Systems | 17134.285 | KB4457128 | Sep 11, 2018 |
| Windows 10 for x64-based Systems | 10240.17976 | KB4457132 | Sep 11, 2018 |
| Windows Server 2016 | 14393.2485 | KB4457131 | Sep 11, 2018 |
| Windows Server 2016 (Server Core installation) | 14393.2485 | KB4457131 | Sep 11, 2018 |
| Windows Server, version 1709 (Server Core Installation) | 16299.665 | KB4457142 | Sep 11, 2018 |
| Windows Server, version 1803 (Server Core Installation) | 17134.285 | KB4457128 | Sep 11, 2018 |