Windows Hyper-V
CVE-2021-1691 — Windows Hyper-V Denial of Service Vulnerability
Executive Summary
None
Overview
7.7
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Changed
Temporal Score: 6.7
EPSS Score
0.03769
probability of exploitation in the next 30 days
0.88525 percentile - updated 2026-06-20
View on FIRST.org
Affected Products
6 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Windows 10 Version 1909 for x64-based Systems | 4598229 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 2004 for x64-based Systems | 4598242 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 20H2 for x64-based Systems | 4598242 (Security Update) |
Important | Denial of Service | Yes |
| Windows Server, version 1909 (Server Core installation) | 4598229 (Security Update) |
Important | Denial of Service | Yes |
| Windows Server, version 2004 (Server Core installation) | 4598242 (Security Update) |
Important | Denial of Service | Yes |
| Windows Server, version 20H2 (Server Core Installation) | 4598242 (Security Update) |
Important | Denial of Service | Yes |
Patches
2 patches
| Article | Type | Restart |
|---|---|---|
4598229 |
Security Update | Yes |
4598242 |
Security Update | Yes |
Known Exploits
No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.
Acknowledgments
Wei
References
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