Windows Telephony Service Remote Code Execution Vulnerability
Heap-based buffer overflow in Windows Telephony Service allows an unauthorized attacker to execute code over a network.
MSRC compact vulnerability detail
CVE-2025-21221 · Windows Telephony Service Remote Code Execution Vulnerability
Heap-based buffer overflow in Windows Telephony Service allows an unauthorized attacker to execute code over a network.
Signals
Windows Telephony Service
Remote Code Execution
Exploited: No
Publicly disclosed: No
Exploitability: Exploitation Less Likely
CWE
Patch Diff
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Resolved binary override
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Description
Heap-based buffer overflow in Windows Telephony Service allows an unauthorized attacker to execute code over a network.
FAQ / Articles
FAQ
Are the updates for Windows 10 for x64-based Systems and Windows 10 for 32-bit Systems currently available? Yes. As of April 9, 2025, the security update (5055547) for Windows 10 for x64-based Systems and Windows 10 for 32-bit Systems are available. Customers running Windows 10 should ensure the update is installed to be protected from this vulnerability.
FAQ
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.