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CVE-2021-42277: Diagnostics Hub Standard Collector Elevation of Privilege Vulnerability

• Severity: medium (CVSS 4.6 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-11-10 · updated 2026-08-19
• Weakness: CWE-269

Description

Diagnostics Hub Standard Collector Elevation of Privilege Vulnerability

Affected products

• Microsoft Visual Studio: 2015-update3
• Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8): from 15.0 through 15.9
• Microsoft Visual Studio 2019: from 16.0 through 16.11
• Microsoft Windows 10 Version 1607: 20h2, 21h1, 1607, 1809, 1909, 2004
• Microsoft Windows 11 version 21H2: all versions
• Microsoft Windows Server 2016: 20h2, 2004
• Microsoft Windows Server 2019: all versions
• Microsoft Windows Server 2022: all versions
• Microsoft Visual Studio 2015 Update 3: from 14.0.0 before 27550.00 — fixed in 27550.00
• Microsoft Visual Studio 2019 version 16.11 (includes 16.0 - 16.10): from 16.11.0 before 16.11.6 — fixed in 16.11.6
• Microsoft Visual Studio 2019 version 16.7 (includes 16.0 – 16.6): from 16.0.0 before 16.7.21 — fixed in 16.7.21
• Microsoft Visual Studio 2019 version 16.9 (includes 16.0 - 16.8): from 15.0.0 before 16.9.13 — fixed in 16.9.13
• Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8): from 15.9.0 before 15.9.41 — fixed in 15.9.41
• Microsoft Windows 10 Version 1507: from 10.0.10240.0 before 10.0.10240.19119 — fixed in 10.0.10240.19119
• Microsoft Windows 10 1607: from 10.0.14393.0 before 10.0.14393.4770 — fixed in 10.0.14393.4770
• Microsoft Windows 10: from 10.0.17763.0 before 10.0.17763.2300 — fixed in 10.0.17763.2300
• Microsoft Windows 10 1909: from 10.0.0 before 10.0.18363.1916 — fixed in 10.0.18363.1916
• Microsoft Windows 10 2004: from 10.0.0 before 10.0.19041.1348 — fixed in 10.0.19041.1348
• Microsoft Windows 10 20H2: from 10.0.0 before 10.0.19042.1348 — fixed in 10.0.19042.1348
• Microsoft Windows 10 21H1: from 10.0.0 before 10.0.19043.1348 — fixed in 10.0.19043.1348
• Microsoft Windows 11 21H2: from 10.0.22000.0 before 10.0.22000.318 — fixed in 10.0.22000.318
• Microsoft Windows Server 2016: from 10.0.14393.0 before 10.0.14393.4770 — fixed in 10.0.14393.4770
• Microsoft Windows Server 2019: from 10.0.17763.0 before 10.0.17763.2300 — fixed in 10.0.17763.2300
• Microsoft Windows Server 2022: from 10.0.20348.0 before 10.0.20348.350 — fixed in 10.0.20348.350
• Microsoft Windows Server version 2004: from 10.0.0 before 10.0.19041.1348 — fixed in 10.0.19041.1348
• Microsoft Windows Server version 20H2: from 10.0.0 before 10.0.19041.1348 — fixed in 10.0.19041.1348

How to fix

Upgrade to a fixed version: Microsoft Visual Studio 2015 Update 3 27550.00; Microsoft Visual Studio 2019 version 16.11 (includes 16.0 - 16.10) 16.11.6; Microsoft Visual Studio 2019 version 16.7 (includes 16.0 – 16.6) 16.7.21; Microsoft Visual Studio 2019 version 16.9 (includes 16.0 - 16.8) 16.9.13; Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8) 15.9.41; Microsoft Windows 10 Version 1507 10.0.10240.19119; Microsoft Windows 10 1607 10.0.14393.4770; Microsoft Windows 10 10.0.17763.2300; Microsoft Windows 10 1909 10.0.18363.1916; Microsoft Windows 10 2004 10.0.19041.1348; Microsoft Windows 10 20H2 10.0.19042.1348; Microsoft Windows 10 21H1 10.0.19043.1348. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-42277
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42277
• https://www.zerodayinitiative.com/advisories/ZDI-21-1306/

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