CVE-2021-1691
Windows Hyper-V Denial of Service Vulnerability
Windows Hyper-V Denial of Service Vulnerability
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Windows Hyper-V Denial of Service Vulnerability
Windows Hyper-V Denial of Service Vulnerability
- Record
CVE-2021-1691- CVSS 3.1
- 7.7 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C - Updated
- 2026-11-02
EUVDEUVD-2021-7158
Windows Hyper-V Denial of Service Vulnerability
- Record
EUVD-2021-7158- CVSS 3.1
- 7.7 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-rr79-vpcm-v7rm
Hyper-V Denial of Service Vulnerability This CVE ID is unique from CVE-2021-1692.
Hyper-V Denial of Service Vulnerability This CVE ID is unique from CVE-2021-1692.
- Record
GHSA-rr79-vpcm-v7rm- CVSS 3.1
- 7.7 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H - Updated
- 2026-11-02
NVD
Windows Hyper-V Denial of Service Vulnerability
- Record
CVE-2021-1691- CVSS 3.1
- 7.7 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H - CVSS 2.0
- 4.0 Medium
AV:N/AC:L/Au:S/C:N/I:N/A:P - Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| facts | ||
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-1691 is a high vulnerability (CVSS 7.7) in Microsoft Windows 10 Version 1909, published January 12, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 4.07%, the 90th percentile. No source names a fixed version.