Security readout for executives and security teams
Plain-English summary
CVE-2021-1706 is a Windows elevation-of-privilege flaw in LUAFV. A successful attacker could turn limited local access into much broader control over an affected Windows system. It is not listed as known exploited in the provided sources, but the impact is high where vulnerable Windows versions remain unpatched.
Executive priority
Treat this as a high-priority patch hygiene issue, especially for legacy Windows estates. It is not shown as actively exploited in the supplied evidence, but privilege-escalation bugs can materially increase business impact after malware, phishing, or insider access.
Technical view
The CVSS 3.1 vector is 7.3 high: local attack, low complexity, low privileges required, user interaction required, unchanged scope, and high confidentiality, integrity, and availability impact. Microsoft lists multiple Windows client and server versions as affected and provides vendor guidance through MSRC.
Likely exposure
Exposure is most likely on endpoints and servers still running affected Windows versions, including Windows 7, 8.1, multiple Windows 10 releases, Windows Server 2008 SP2, 2016, 2019, and Server Core variants listed by Microsoft.
Exploitation context
The provided bundle does not show active exploitation: KEV is false and the CVSS temporal vector marks exploit maturity as unproven. The vulnerability requires local access with low privileges and user interaction, so it is more relevant after initial compromise than as an internet-entry vulnerability.
Researcher notes
Public detail in the bundle is limited. Microsoft identifies LUAFV elevation of privilege, affected Windows versions, and update guidance, but no CWE, root-cause details, workaround, or exploitation narrative are provided. Avoid assuming exploitability beyond the CVSS vector and vendor advisory.
Mitigation direction
- Apply Microsoft’s security update for CVE-2021-1706 on affected supported Windows systems.
- Prioritize systems with local user access, shared workstations, and exposed administrative workflows.
- Retire or isolate unsupported Windows versions that cannot receive applicable vendor updates.
- Review Microsoft MSRC guidance for version-specific update applicability and any later revisions.
Validation and detection
- Inventory Windows versions against Microsoft’s affected product list for CVE-2021-1706.
- Confirm the applicable Microsoft security update is installed on each affected host.
- Check vulnerability scanner results for CVE-2021-1706 and reconcile exceptions manually.
- Validate unsupported systems have compensating controls or documented decommission plans.
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.
Privilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-1706 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
- 7.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/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:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C1.35.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.3HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Source materials
- CVE List V5 sourceCVE List V5
- Windows LUAFV Elevation of Privilege VulnerabilityCVE reference · vendor-advisory
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1706CVE 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.