CVE-2025-21273
Published: 14 January 2025
Summary
CVE-2025-21273 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 Exploit Public-Facing Application (T1190); ranked in the top 17.8% 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).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
Directly remediates the specific RCE flaw in Windows Telephony Service through timely application of vendor patches and updates.
Provides memory protections such as ASLR and stack canaries that mitigate exploitation of the stack-based buffer overflow (CWE-122) leading to RCE.
Enforces input validation to restrict malformed or oversized inputs to the Windows Telephony Service, reducing the risk of buffer overflow exploitation.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
RCE vulnerability with network attack vector enables remote exploitation of the Telephony Service (T1190) and client-side execution via user interaction trigger (T1203).
NVD Description
Windows Telephony Service Remote Code Execution Vulnerability
Deeper analysisAI
CVE-2025-21273 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 associated with CWE-122 and NVD-CWE-noinfo.
The vulnerability can be exploited remotely over the network by an unauthenticated attacker with low attack complexity, though it requires user interaction. Successful exploitation enables high-impact effects on confidentiality, integrity, and availability, allowing the attacker to execute arbitrary code on the affected system.
Mitigation details are available in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21273.
Details
- CWE(s)