Vulnerability · Published Mar 11, 2021 · Assigned by microsoft
CVE-2021-26866Windows Update Service Elevation of Privilege Vulnerability
High 7.1
In plain English
A high-severity security flaw in Windows 10 Version 1507 from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.2% (higher than 67% of all known vulnerabilities).
Severity (CVSS 3.1)7.1High
Exploit odds (30 days)1.2%top 32.8% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
Windows Update Service Elevation of Privilege Vulnerability
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Windows 10 Version 1507 | 10.0.10240.0 – before 10.0.10240.18874 |
| Microsoft | Windows 10 Version 1607 | 10.0.14393.0 – before 10.0.14393.4283 |
| Microsoft | Windows 10 Version 1803 | 10.0.0 – before 10.0.17134.2087 |
| Microsoft | Windows 10 Version 1809 | 10.0.17763.0 – before 10.0.17763.1817 |
| Microsoft | Windows 10 Version 1809 | 10.0.0 – before 10.0.17763.1817 |
| Microsoft | Windows 10 Version 1909 | 10.0.0 – before 10.0.18363.1440 |
| Microsoft | Windows 10 Version 2004 | 10.0.0 – before 10.0.19043.867 |
| Microsoft | Windows 10 Version 20H2 | 10.0.0 – before 10.0.19043.867 |
| Microsoft | Windows Server 2016 | 10.0.14393.0 – before 10.0.14393.4283 |
| Microsoft | Windows Server 2016 (Server Core installation) | 10.0.14393.0 – before 10.0.14393.4283 |
| Microsoft | Windows Server 2019 | 10.0.17763.0 – before 10.0.17763.1817 |
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.17763.0 – before 10.0.17763.1817 |
| Microsoft | Windows Server version 2004 | 10.0.0 – before 10.0.19043.867 |
| Microsoft | Windows Server version 20H2 | 10.0.0 – before 10.0.19043.867 |
| Microsoft | Windows Server, version 1909 (Server Core installation) | 10.0.0 – before 10.0.18363.1440 |
References
- Windows Update Service Elevation of Privilege Vulnerability vendor-advisory, patch
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26866 x_refsource_MISC, x_transferred
- https://www.zerodayinitiative.com/advisories/ZDI-21-286/ x_refsource_MISC, x_transferred