CVE-2021-26866 : Windows Update Service Elevation of Privilege Vulnerability

Windows Update Service Elevation of Privilege Vulnerability

Published 2021-03-11 16:15:14

Updated 2023-12-29 20:15:51

View at NVD, CVE.org

Vulnerability category: Gain privilege

Products affected by CVE-2021-26866

Microsoft » Windows 10 » Version: N/A
cpe:2.3:o:microsoft:windows_10:-:*:*:*:*:*:*:*
Matching versions
Microsoft » Windows 10 » Version: 1607
cpe:2.3:o:microsoft:windows_10:1607:*:*:*:*:*:*:*
Matching versions
Microsoft » Windows 10 » Version: 1803
cpe:2.3:o:microsoft:windows_10:1803:*:*:*:*:*:*:*
Matching versions
Microsoft » Windows 10 » Version: 1809
cpe:2.3:o:microsoft:windows_10:1809:*:*:*:*:*:*:*
Matching versions
Microsoft » Windows 10 » Version: 1909
cpe:2.3:o:microsoft:windows_10:1909:*:*:*:*:*:*:*
Matching versions
Microsoft » Windows 10 » Version: 20h2
cpe:2.3:o:microsoft:windows_10:20h2:*:*:*:*:*:*:*
Matching versions
Microsoft » Windows 10 » Version: 2004
cpe:2.3:o:microsoft:windows_10:2004:*:*:*:*:*:*:*
Matching versions
Microsoft » Windows Server 2016 » Version: N/A
cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:*
Matching versions
Microsoft » Windows Server 2016 » Version: 1909
cpe:2.3:o:microsoft:windows_server_2016:1909:*:*:*:*:*:*:*
Matching versions
Microsoft » Windows Server 2016 » Version: 20h2
cpe:2.3:o:microsoft:windows_server_2016:20h2:*:*:*:*:*:*:*
Matching versions
Microsoft » Windows Server 2016 » Version: 2004
cpe:2.3:o:microsoft:windows_server_2016:2004:*:*:*:*:*:*:*
Matching versions
Microsoft » Windows Server 2019 » Version: N/A
cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:*
Matching versions

EPSS FAQ

0.13%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 48 %

Percentile, the proportion of vulnerabilities that are scored at or less

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
3.6	LOW	AV:L/AC:L/Au:N/C:N/I:P/A:P	3.9	4.9	NIST
Access Vector: Local Access Complexity: Low Authentication: None Confidentiality Impact: None Integrity Impact: Partial Availability Impact: Partial
6.1	MEDIUM	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H	1.8	4.2	NIST
Attack Vector: Local Attack Complexity: Low Privileges Required: Low User Interaction: None Scope: Unchanged Confidentiality: None Integrity: Low Availability: High
7.1	HIGH	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H	1.8	5.2	Microsoft Corporation
Attack Vector: Local Attack Complexity: Low Privileges Required: Low User Interaction: None Scope: Unchanged Confidentiality: None Integrity: High Availability: High

CWE-59 Improper Link Resolution Before File Access ('Link Following')

The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

Assigned by: nvd@nist.gov (Primary)

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26866

CVE-2021-26866 - Security Update Guide - Microsoft - Windows Update Service Elevation of Privilege Vulnerability
Patch;Vendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-286/

ZDI-21-286 | Zero Day Initiative
Third Party Advisory;VDB Entry

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