CVE-2021-34486: Technical Deep-Dive (Auto Refreshed)

Generated on 2026-03-30T13:19:45.617Z. This file is automatically regenerated every 30 minutes by the CVE AI enrichment job using web sources (NVD, MITRE, CISA KEV, GitHub).

Executive Technical Summary

Microsoft Windows Event Tracing contains an unspecified vulnerability which can allow for privilege escalation.

• Context preserved from previous revision: Windows Event Tracing Elevation of Privilege Vulnerability Notes: Ostorlab KEV: One-command to detect most remotely known exploitable vulnerabilities. Sourced from CISA KEV, Google's Tsunami, Ostorlab's Asteroid and Bug Bounty programs.

Technical Details

• CVE: CVE-2021-34486
• KEV date added: 2022-03-28
• KEV due date: 2022-04-18
• NVD published: Unknown
• NVD modified: Unknown
• MITRE modified: 2025-10-21
• CVSS base score: N/A
• CVSS vector: N/A
• CVSS exploitability score: N/A
• CVSS impact score: N/A
• Attack vector: Unknown
• Attack complexity: Unknown
• Privileges required: Unknown
• User interaction: Unknown
• Scope: Unknown
• Confidentiality impact: Unknown
• Integrity impact: Unknown
• Availability impact: Unknown

Versions and Products Impacted

• Microsoft / Windows 10 Version 1809 (versions: 10.0.0)
• Microsoft / Windows Server 2019 (versions: 10.0.0)
• Microsoft / Windows Server 2019 (Server Core installation) (versions: 10.0.0)
• Microsoft / Windows 10 Version 1909 (versions: 10.0.0)
• Microsoft / Windows 10 Version 21H1 (versions: 10.0.0)
• Microsoft / Windows 10 Version 2004 (versions: 10.0.0)
• Microsoft / Windows Server version 2004 (versions: 10.0.0)
• Microsoft / Windows 10 Version 20H2 (versions: 10.0.0)
• Microsoft / Windows Server version 20H2 (versions: 10.0.0)

Weakness Classification

• CWE-416

Repositories for Lab Validation (Public Examples)

• No public repository matched this CVE query in the current run.

People and Organizations Mentioned

• microsoft
• Windows

Practical Defensive Validation (Authorized Only)

1. Use only isolated environments and systems you own or are explicitly authorized to test.
2. Snapshot infrastructure before validation and preserve baseline logs (EDR, SIEM, OS, app).
3. Create low-privilege users on Microsoft / Windows 10 Version 1809 (versions: 10.0.0) and validate that patching blocks unauthorized admin-level actions.
4. Compare token/privilege transitions in Windows Event Logs before and after remediation.
5. Tune detections for unusual group membership changes and SYSTEM-level process launches from user sessions.

References

• NVD record: https://nvd.nist.gov/vuln/detail/CVE-2021-34486
• MITRE CVE record: https://www.cve.org/CVERecord?id=CVE-2021-34486
• CISA KEV Catalog: https://www.cisa.gov/known-exploited-vulnerabilities-catalog
• CISA KEV JSON feed: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json
• KEV notes: https://nvd.nist.gov/vuln/detail/CVE-2021-34486
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34486
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-34486

This content is for defensive security training and authorized validation only.