Back to board Open MSRC
MSRC compact vulnerability detail

CVE-2025-27477 · 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.

Severity
Important
Impact
Remote Code Execution
CVSS
8.8 base · 7.7 temporal
Release
2025-04-08
Signals
Windows Telephony Service Remote Code Execution Exploited: No Publicly disclosed: No Exploitability: Exploitation Less Likely
CWE
CWE-122: Heap-based Buffer Overflow
Patch Diff
Loading module diff metadata...
Resolved binary override
Use this when the MSRC module name cannot be mapped automatically or the resolved binary looks wrong.
Old version New version
Description
Heap-based buffer overflow in Windows Telephony Service allows an unauthorized attacker to execute code over a network.
FAQ / Articles
FAQ
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.
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.
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.