CVE-2025-21240

Summary

CVE-2025-21240 is a remote code execution vulnerability affecting the Windows Telephony Service. Successful exploitation allows an attacker to execute arbitrary code on a vulnerable system. The vulnerability stems from a weakness in the way the service handles certain telephony messages, which can result in memory corruption and code injection. Exploitation could lead to significant security risks, including data theft, unauthorized system access, or the installation of malware. Microsoft has released a patch to address this issue, and it is strongly recommended that all Windows users install the update to mitigate the risk.

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