CVE-2025-21250
Published: 14 January 2025
Summary
CVE-2025-21250 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 24.2% 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-2 (Flaw Remediation) and SI-10 (Information Input Validation).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
Directly requires timely patching of the specific buffer overflow vulnerability in Windows Telephony Service to prevent remote code execution.
Provides memory protections such as ASLR and DEP that mitigate exploitation of the buffer overflow leading to RCE in the service.
Enforces input validation to counter buffer overflows triggered by crafted content processed by the Windows Telephony Service.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
RCE in remotely accessible Windows Telephony Service directly maps to exploitation of remote services.
NVD Description
Windows Telephony Service Remote Code Execution Vulnerability
Deeper analysisAI
CVE-2025-21250 is a Remote Code Execution vulnerability in the Windows Telephony Service, a component of Microsoft Windows operating systems. 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 associated with CWE-122, indicating a likely buffer overflow issue with insufficient additional details from NVD-CWE-noinfo.
The vulnerability can be exploited over the network by unauthenticated remote attackers with low complexity, but requires user interaction, such as clicking a malicious link or processing crafted content. Successful exploitation enables arbitrary code execution on the affected system under the context and privileges of the Windows Telephony Service, granting high-impact access to compromise confidentiality, integrity, and availability.
Microsoft's update guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21250 provides details on available patches and mitigation recommendations, which security practitioners should apply promptly to affected Windows systems.
Details
- CWE(s)