CVE-2026-20931

HIGH EXPLOITED

Windows Telephony Service - Privilege Escalation

Title source: llm
STIX 2.1

Description

External control of file name or path in Windows Telephony Service allows an authorized attacker to elevate privileges over an adjacent network.

References (1)

Scores

CVSS v3 8.0
EPSS 0.0079
EPSS Percentile 73.9%
Attack Vector ADJACENT_NETWORK
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

VulnCheck KEV 2026-02-24
CWE
CWE-73
Status published
Products (40)
Microsoft/Windows 10 Version 1607 10.0.14393.0 - 10.0.14393.8783
Microsoft/Windows 10 Version 1809 10.0.17763.0 - 10.0.17763.8276
Microsoft/Windows 10 Version 21H2 10.0.19044.0 - 10.0.19044.6809
Microsoft/Windows 10 Version 22H2 10.0.19045.0 - 10.0.19045.6809
Microsoft/Windows 11 version 22H3 10.0.22631.0 - 10.0.22631.6491
Microsoft/Windows 11 Version 23H2 10.0.22631.0 - 10.0.22631.6491
Microsoft/Windows 11 Version 24H2 10.0.26100.0 - 10.0.26100.7623
Microsoft/Windows 11 Version 25H2 10.0.26200.0 - 10.0.26200.7623
Microsoft/Windows Server 2008 R2 Service Pack 1 6.1.7601.0 - 6.1.7601.28117
Microsoft/Windows Server 2008 R2 Service Pack 1 (Server Core installation) 6.1.7601.0 - 6.1.7601.28117
... and 30 more
Published Jan 13, 2026
Tracked Since Feb 18, 2026