CVE-2025-21305
Published: 14 January 2025
Summary
CVE-2025-21305 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 20.8% 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-2 (Flaw Remediation) and SI-16 (Memory Protection).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
Directly prevents exploitation of CVE-2025-21305 by requiring timely application of vendor patches to the vulnerable Windows Telephony Service.
Mitigates remote code execution from the heap-based buffer overflow (CWE-122) by enforcing memory protections such as DEP and ASLR to block unauthorized code execution.
Antimalware scanning detects and blocks malicious files or links crafted to trigger the Windows Telephony Service vulnerability.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
RCE vulnerability requires user interaction with malicious link or crafted file to trigger arbitrary code execution on client, directly enabling T1203 (Exploitation for Client Execution) and T1204 subtechniques (User Execution via malicious link/file).
NVD Description
Windows Telephony Service Remote Code Execution Vulnerability
Deeper analysisAI
CVE-2025-21305 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.
A remote, unauthenticated attacker can exploit this vulnerability by tricking a user into some form of interaction, such as clicking a malicious link or opening a crafted file. Successful exploitation enables arbitrary code execution on the target system, resulting in high impacts to confidentiality, integrity, and availability.
The Microsoft Security Response Center update guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21305 provides details on associated advisories and patches for mitigation.
Details
- CWE(s)