CVE-2025-21252
Published: 14 January 2025
Summary
CVE-2025-21252 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 15.0% 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-2025-21252 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 reflecting network attack vector, low complexity, no required privileges, and required user interaction.
An unauthenticated remote attacker can trigger the flaw over the network to execute arbitrary code, resulting in full compromise of confidentiality, integrity, and availability on the affected system.
Microsoft published an advisory for the issue at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21252. The associated EPSS score has remained flat at 0.0225 with no material rise from its initial value.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-2318
Vulnerability details
Windows Telephony Service Remote Code Execution Vulnerability
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
RCE in Windows Telephony Service with network vector directly enables exploitation of remote services for code execution.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Timely remediation of identified flaws, including applying Microsoft patches for CVE-2025-21252, directly eliminates the buffer overflow vulnerability in Windows Telephony Service.
Memory protection mechanisms such as DEP, ASLR, and stack canaries directly mitigate exploitation of the stack-based buffer overflow (CWE-122) leading to remote code execution.
Malicious code protection scans for and blocks exploit payloads that attempt arbitrary code execution via the Windows Telephony Service vulnerability.