Security readout for executives and security teams
Plain-English summary
CVE-2021-1690 is a high-severity Windows WalletService privilege-escalation issue. An attacker already running low-privileged code on an affected Windows 10 system could potentially gain higher privileges, increasing the impact of malware, phishing footholds, or insider misuse.
Executive priority
Prioritize remediation in standard Windows patch cycles, with faster action for privileged workstations and broadly used endpoints. This is not presented as actively exploited, but it can increase damage after an attacker gains initial local access.
Technical view
The provided CVSS 3.1 vector is 7.8: local attack vector, low complexity, low privileges required, no user interaction, unchanged scope, and high confidentiality, integrity, and availability impact. Affected products listed are multiple Windows 10 releases from 1507 through 20H2.
Likely exposure
Exposure is most likely on older or unpatched Windows 10 endpoints running affected versions: 1507, 1607, 1803, 1809, 1909, 2004, or 20H2. The bundle does not identify non-Windows products or server editions.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation. CVSS marks exploit maturity as unproven. Treat this as a serious post-compromise escalation risk rather than evidence of an internet-reachable entry point.
Researcher notes
Evidence is limited to the CVE metadata and Microsoft advisory references. The bundle does not include root-cause details, proof-of-concept status, specific KB numbers, or workaround instructions, so validation should rely on MSRC and patch inventory.
Mitigation direction
- Apply Microsoft security updates for CVE-2021-1690 according to MSRC guidance.
- Prioritize affected Windows 10 endpoints with local user access or high business impact.
- Reduce local admin rights and enforce least privilege on Windows endpoints.
- Monitor Microsoft guidance for any superseding update or deployment caveats.
Validation and detection
- Inventory Windows 10 versions against the affected version list.
- Confirm security update compliance for CVE-2021-1690 in endpoint management tooling.
- Review EDR telemetry for suspicious local privilege escalation behavior.
- Verify WalletService exposure assumptions against Microsoft advisory details.
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-2021-1690 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
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/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:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C1.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Source materials
- CVE List V5 sourceCVE List V5
- Windows WalletService Elevation of Privilege VulnerabilityCVE reference · vendor-advisory
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1690CVE 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.