Security readout for executives and security teams
Plain-English summary
CVE-2021-1692 is a Windows Hyper-V denial-of-service flaw. A low-privileged attacker could affect availability of vulnerable Hyper-V systems, potentially disrupting virtualized workloads. The source bundle does not show active exploitation, but Microsoft lists official remediation, so exposed Hyper-V hosts should be prioritized for patch verification.
Executive priority
Treat as a high-priority infrastructure patching item, especially for virtualization hosts. The main business risk is service disruption, not data theft, based on the supplied CVSS impact fields.
Technical view
The CVSS 3.1 vector is 7.7 high: network attack vector, low complexity, low privileges, no user interaction, changed scope, and high availability impact only. Affected platforms include Windows Server 2012 R2 through 20H2-era releases, Windows Server 2016/2019, Windows 8.1, and multiple Windows 10 versions running Hyper-V.
Likely exposure
Exposure is most likely on Hyper-V hosts or Windows systems with Hyper-V enabled on the listed affected releases. Risk is higher where those hosts run business-critical virtual machines or shared infrastructure services.
Exploitation context
The provided sources do not indicate active exploitation, and KEV status is false. The CVSS vector indicates remote reachability with low privileges, but the bundle does not provide exploit maturity beyond E:U or technical root-cause detail.
Researcher notes
Evidence is limited to advisory-level data. The key technical signal is availability-only impact with low-complexity, low-privilege, no-UI conditions. Avoid assuming exploitability details, affected configurations beyond Hyper-V, or mitigations not present in Microsoft guidance.
Mitigation direction
- Apply the Microsoft security update applicable to CVE-2021-1692.
- Prioritize Hyper-V hosts running critical workloads.
- Review MSRC guidance for exact affected builds and update packages.
- Reduce exposure of management and host interfaces where operationally feasible.
Validation and detection
- Inventory Windows systems with the Hyper-V role or feature enabled.
- Compare OS versions against the affected product list.
- Verify the relevant Microsoft update is installed on each exposed host.
- Confirm vulnerable hosts are not supporting critical workloads without compensating controls.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2021-1692 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.7 (3.1)
- Known Exploited
- No
- Published
Vector: 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
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C3.14Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.7HighVector: 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
Source materials
- CVE List V5 sourceCVE List V5
- Windows Hyper-V Denial of Service VulnerabilityCVE reference · vendor-advisory
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1692CVE reference · x_refsource_MISC, x_transferred
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.