Summary
Impact: Remote Code Execution. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
According to the CVSS metric, the attack vector is network (AV:N) and the user interaction is required (UI:R). What is the target context of the remote code execution?
This attack requires a client to connect to a malicious server, and that could allow the attacker to gain code execution on the client.
How could an attacker exploit this vulnerability?
An attacker could exploit this vulnerability by tricking a user into sending a request to a malicious server. This could result in the server returning malicious data that might cause arbitrary code execution on the user's system.
Security updates
10.0.17763.6893 — https://support.microsoft.com/help/5052000
10.0.20348.3207 — https://support.microsoft.com/help/5051979
10.0.20348.3148 — https://support.microsoft.com/help/5052106
10.0.19044.5487 — https://support.microsoft.com/help/5051974
10.0.22621.4890 — https://support.microsoft.com/help/5051989
10.0.26100.3194 — https://support.microsoft.com/help/5051987
10.0.26100.3107 — https://support.microsoft.com/help/5052105
10.0.25398.1425 — https://support.microsoft.com/help/5051980
10.0.10240.20915 — https://support.microsoft.com/help/5052040
10.0.14393.7785 — https://support.microsoft.com/help/5052006
6.0.6003.23117 — https://support.microsoft.com/help/5052038
6.0.6003.23117 — https://support.microsoft.com/help/5052072
6.1.7601.27566 — https://support.microsoft.com/help/5052016
6.1.7601.27566 — https://support.microsoft.com/help/5052032
6.2.9200.25317 — https://support.microsoft.com/help/5052020
6.3.9600.22417 — https://support.microsoft.com/help/5052042
Vulnerabilities 1
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High 8.8
Windows Telephony Service Remote Code Execution Vulnerability
Windows Telephony Service Remote Code Execution Vulnerability
Revision history
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#1
Information published.
References
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CVE-2025-21407 Windows Telephony Service Remote Code Execution Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21407
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss