CVE-2025-21246
Published: 14 January 2025
Summary
CVE-2025-21246 is a high-severity Heap-based Buffer Overflow (CWE-122) vulnerability in Microsoft Windows 10 1507. Its CVSS base score is 8.8 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation of Remote Services (T1210); ranked in the top 28.6% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
Directly mitigates the RCE vulnerability by requiring timely patching of the heap-based buffer overflow in Windows Telephony Service as provided by Microsoft.
Prevents remote exploitation by validating network inputs to the telephony service, addressing the root causes of heap buffer overflow and out-of-bounds read.
Mitigates successful heap-based exploits through memory protections that restrict code execution and modifications in privileged memory regions.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Remote unauthenticated network exploitation of Windows Telephony Service buffer overflow directly maps to exploitation of remote services for RCE.
NVD Description
Windows Telephony Service Remote Code Execution Vulnerability
Deeper analysisAI
CVE-2025-21246 is a Remote Code Execution vulnerability in the Windows Telephony Service. Published on 2025-01-14, it carries a CVSS v3.1 base score of 8.8 (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) and is linked to CWE-122 (Heap-based Buffer Overflow), CWE-125 (Out-of-bounds Read), and NVD-CWE-noinfo.
Unauthenticated remote attackers can exploit this vulnerability over the network with low attack complexity and no privileges required, though it necessitates user interaction. Successful exploitation enables high-impact effects on confidentiality, integrity, and availability, allowing arbitrary code execution on affected systems.
Microsoft provides mitigation guidance, including patches, in their Security Update Guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21246.
Details
- CWE(s)