Actively exploited · Published Aug 12, 2021 · Assigned by microsoft
CVE-2021-34486Windows Event Tracing Elevation of Privilege Vulnerability
High 7.8 Exploited
In plain English
A high-severity use-after-free in Windows 10 Version 1809 from Microsoft. Attackers are actively exploiting it in the wild (listed by CISA on March 28, 2022). The chance it is exploited in the next 30 days is estimated at 9.3% (higher than 95% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Apply updates per vendor instructions.
Severity (CVSS 3.1)7.8High
Exploit odds (30 days)9.3%top 4.6% of all CVEs
Exploited in the wildYesCISA KEV since Mar 28, 2022
Attack tooling1Public PoC
CISA guidance
Apply updates per vendor instructions.
Federal agencies must remediate by Apr 18, 2022.
Official description
Windows Event Tracing Elevation of Privilege Vulnerability
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Windows 10 Version 1809 | 10.0.17763.0 – before 10.0.17763.2114 |
| Microsoft | Windows 10 Version 1809 | 10.0.0 – before 10.0.17763.2114 |
| Microsoft | Windows 10 Version 1909 | 10.0.0 – before 10.0.18363.1734 |
| Microsoft | Windows 10 Version 2004 | 10.0.0 – before 10.0.19041.1165 |
| Microsoft | Windows 10 Version 20H2 | 10.0.0 – before 10.0.19042.1165 |
| Microsoft | Windows 10 Version 21H1 | 10.0.0 – before 10.0.19043.1165 |
| Microsoft | Windows Server 2019 | 10.0.17763.0 – before 10.0.17763.2114 |
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.17763.0 – before 10.0.17763.2114 |
| Microsoft | Windows Server version 2004 | 10.0.0 – before 10.0.19041.1165 |
| Microsoft | Windows Server version 20H2 | 10.0.0 – before 10.0.19042.1165 |
Weakness: CWE-416 · 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
References
- Windows Event Tracing Elevation of Privilege Vulnerability vendor-advisory, patch
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34486 x_refsource_MISC, x_transferred
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-34486 government-resource