Security readout for executives and security teams
Plain-English summary
CVE-2021-1674 is a Microsoft Windows Remote Desktop Protocol Core security feature bypass. Microsoft rates it high severity with a CVSS 3.1 score of 8.8. The available sources do not show known active exploitation or KEV listing, but the network attack vector and high impact ratings make timely remediation important.
Executive priority
Treat this as a high-priority Windows patching item, especially for environments with Remote Desktop exposure. There is no source-provided evidence of active exploitation, so prioritize by exposure and business criticality rather than emergency KEV handling.
Technical view
The CVSS vector indicates network access, low attack complexity, low privileges required, no user interaction, unchanged scope, and high confidentiality, integrity, and availability impact. Affected platforms include multiple Windows 10, Windows Server, Windows 7, and Windows 8.1 versions listed in the source bundle. Microsoft’s advisory is the authoritative remediation source.
Likely exposure
Exposure is most relevant to organizations running the affected Microsoft Windows client or server versions, particularly systems where Remote Desktop Protocol access is reachable by users or network segments beyond tightly controlled administrative paths.
Exploitation context
The bundle marks KEV as false and provides no cited evidence of active exploitation. The CVSS exploit maturity field is E:U, indicating unproven exploitation in the provided metadata. Do not treat this as actively exploited without newer vendor, KEV, or threat intelligence evidence.
Researcher notes
Source detail is limited to the CVE description, affected platforms, CVSS vector, and Microsoft references. The title identifies an RDP Core security feature bypass, but the bundle does not provide root cause, exploit technique, proof-of-concept status, or product-specific KB details.
Mitigation direction
- Review the Microsoft MSRC advisory for the applicable affected product and update package.
- Deploy Microsoft’s official remediation for affected Windows systems through approved patch management.
- Prioritize internet-exposed or broadly reachable Remote Desktop environments.
- Restrict RDP access to trusted administrative networks where operationally possible.
- Check vendor guidance before applying compensating controls not named in the advisory.
Validation and detection
- Inventory Windows versions against the affected product list in the source bundle.
- Confirm whether each affected host has received Microsoft’s official remediation.
- Identify systems where RDP is reachable from untrusted or broad network paths.
- Validate patch status with endpoint management or vulnerability scanning records.
- Recheck MSRC for product-specific guidance and supersedence information.
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-2021-1674 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
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/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:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/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 Remote Desktop Protocol Core Security Feature Bypass VulnerabilityCVE reference · vendor-advisory
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1674CVE 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.