CVE-2024-21439: Windows Telephony Server Elevation of Privilege Vulnerability

Severity: high (CVSS 7.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-03-12 · updated 2026-06-17
Weakness: CWE-416

Description

Windows Telephony Server Elevation of Privilege Vulnerability

Affected products

Microsoft Windows 10 Version 1507: before 10.0.10240.20526 — fixed in 10.0.10240.20526
Microsoft Windows 10 1607: before 10.0.14393.6796 — fixed in 10.0.14393.6796
Microsoft Windows 10: before 10.0.17763.5576 — fixed in 10.0.17763.5576
Microsoft Windows 10: before 10.0.19044.4170 — fixed in 10.0.19044.4170
Microsoft Windows 10: before 10.0.19045.4170 — fixed in 10.0.19045.4170
Microsoft Windows 11 21H2: before 10.0.22000.2836 — fixed in 10.0.22000.2836
Microsoft Windows 11: before 10.0.22621.3296 — fixed in 10.0.22621.3296
Microsoft Windows 11: before 10.0.22631.3296 — fixed in 10.0.22631.3296
Microsoft Windows Server 2008: r2-sp1
Microsoft Windows Server 2012: r2
Microsoft Windows Server 2016: before 10.0.14393.6796 — fixed in 10.0.14393.6796
Microsoft Windows Server 2019: before 10.0.17763.5576 — fixed in 10.0.17763.5576
Microsoft Windows Server 2022: before 10.0.20348.2340 — fixed in 10.0.20348.2340
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): before 10.0.25398.763 — fixed in 10.0.25398.763
Microsoft Windows 10 Version 1507: from 10.0.10240.0 before 10.0.10240.20526 — fixed in 10.0.10240.20526
Microsoft Windows 10 1607: from 10.0.14393.0 before 10.0.14393.6796 — fixed in 10.0.14393.6796
Microsoft Windows 10: from 10.0.17763.0 before 10.0.17763.5576 — fixed in 10.0.17763.5576
Microsoft Windows 10: from 10.0.19043.0 before 10.0.19044.4170 — fixed in 10.0.19044.4170
Microsoft Windows 10: from 10.0.19045.0 before 10.0.19045.4170 — fixed in 10.0.19045.4170
Microsoft Windows 11 21H2: from 10.0.0 before 10.0.22000.2836 — fixed in 10.0.22000.2836
Microsoft Windows 11: from 10.0.22621.0 before 10.0.22621.3296 — fixed in 10.0.22621.3296
Microsoft Windows 11 version 22H3: from 10.0.22631.0 before 10.0.22631.3296 — fixed in 10.0.22631.3296
Microsoft Windows 11: from 10.0.22631.0 before 10.0.22631.3296 — fixed in 10.0.22631.3296
Microsoft Windows Server 2008 R2 Service Pack 1: from 6.1.7601.0 before 6.1.7601.27017 — fixed in 6.1.7601.27017
Microsoft Windows Server 2008 Service Pack 2: from 6.0.6003.0 before 6.0.6003.22567 — fixed in 6.0.6003.22567
Microsoft Windows Server 2012: from 6.2.9200.0 before 6.2.9200.24768 — fixed in 6.2.9200.24768
Microsoft Windows Server 2012 R2: from 6.3.9600.0 before 6.3.9600.21871 — fixed in 6.3.9600.21871
Microsoft Windows Server 2016: from 10.0.14393.0 before 10.0.14393.6796 — fixed in 10.0.14393.6796
Microsoft Windows Server 2019: from 10.0.17763.0 before 10.0.17763.5576 — fixed in 10.0.17763.5576
Microsoft Windows Server 2022: from 10.0.20348.0 before 10.0.20348.2340 — fixed in 10.0.20348.2340

How to fix

Upgrade to a fixed version: Microsoft Windows 10 Version 1507 10.0.10240.20526; Microsoft Windows 10 1607 10.0.14393.6796; Microsoft Windows 10 10.0.17763.5576; Microsoft Windows 10 10.0.19044.4170; Microsoft Windows 10 10.0.19045.4170; Microsoft Windows 11 21H2 10.0.22000.2836; Microsoft Windows 11 10.0.22621.3296; Microsoft Windows 11 10.0.22631.3296; Microsoft Windows Server 2016 10.0.14393.6796; Microsoft Windows Server 2019 10.0.17763.5576; Microsoft Windows Server 2022 10.0.20348.2340; Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.763. Check the vendor advisory for mitigations.

References

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