CVE-2025-21302
Published: 14 January 2025
Summary
CVE-2025-21302 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 for Client Execution (T1203); ranked in the top 17.5% 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-16 (Memory Protection) and SI-2 (Flaw Remediation).
Deeper analysis
The vulnerability CVE-2025-21302 is a remote code execution flaw affecting the Windows Telephony Service and is tracked under CWE-122. It received a CVSS 3.1 score of 8.8 and was published on January 14, 2025.
An attacker can exploit the issue over a network with low attack complexity, no authentication, and only user interaction required, resulting in full impact to confidentiality, integrity, and availability on the target system.
Microsoft has published an advisory containing mitigation details at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21302. The associated EPSS score remains flat at 0.0167 with no material rise observed.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-2367
Vulnerability details
Windows Telephony Service Remote Code Execution Vulnerability
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
The CVE is a remote code execution vulnerability in Windows Telephony Service with AV:N, PR:N, and UI:R, directly enabling exploitation for client execution (T1203) and facilitating arbitrary command/script execution (T1059) upon successful exploitation.
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Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly remediates the remote code execution vulnerability in Windows Telephony Service by applying timely vendor patches as published by Microsoft.
Provides memory protection mechanisms like DEP and ASLR that defend against heap-based buffer overflow (CWE-122) exploitation in the telephony service.
Enforces input validation for data processed by the Windows Telephony Service, mitigating buffer overflow conditions triggered by unauthenticated remote inputs requiring user interaction.