Security readout for executives and security teams
Plain-English summary
CVE-2021-34513 is a Windows Storage Spaces Controller elevation of privilege issue. An attacker who already has low-privileged local access could potentially gain high-impact control over confidentiality, integrity, and availability. It is not described as remotely exploitable from the provided sources.
Executive priority
Prioritize remediation through normal high-severity Windows patching. Business urgency rises for multi-user systems, exposed workstations, or environments where a foothold could become domain or data access.
Technical view
The provided CVSS v3.1 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 entries include several Windows 10 and Windows Server 2004/20H2 releases.
Likely exposure
Exposure is most relevant on endpoints or servers running the listed Windows 10 versions 1909, 2004, 20H2, 21H1, or Windows Server versions 2004 and 20H2.
Exploitation context
The bundle does not show CISA KEV listing or public active exploitation. CVSS exploit maturity is marked unproven. Treat this as a serious post-compromise privilege escalation risk, not an initial access vulnerability.
Researcher notes
Evidence is limited to the CVE bundle, MSRC, ZDI reference, CVSS vector, and affected product list. No exploit mechanism, proof of concept, or exact KB mapping is included here, so validation should rely on Microsoft advisory data and asset inventory.
Mitigation direction
- Review the Microsoft MSRC advisory for applicable security updates.
- Patch affected Windows endpoints and servers according to vendor guidance.
- Prioritize shared workstations, developer machines, and multi-user servers.
- Restrict local logon and low-privileged account access where feasible.
- Monitor Microsoft guidance for superseded update or lifecycle details.
Validation and detection
- Inventory Windows versions against the affected product list.
- Confirm applicable Microsoft security updates are installed.
- Check whether listed Windows builds remain in service or unsupported.
- Review endpoint controls for local privilege escalation detections.
- Validate high-risk hosts after patching through standard vulnerability scanning.
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-2021-34513 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
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34513CVE reference · x_refsource_MISC
- https://www.zerodayinitiative.com/advisories/ZDI-21-875/CVE reference · x_refsource_MISC
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.