CVE-2025-21409
Published: 14 January 2025
Summary
CVE-2025-21409 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 9.1% 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 heap-based buffer overflow in Windows Telephony Service by requiring timely application of Microsoft's security patch.
Implements memory protections like ASLR, DEP, and heap isolation to prevent arbitrary code execution from heap buffer overflows.
Requires validation of network inputs to the Telephony Service to block malformed data triggering the buffer overflow.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
The RCE vulnerability in the Windows Telephony Service requires user interaction (e.g., malicious link or file) for remote exploitation leading to arbitrary code execution, directly mapping to Exploitation for Client Execution.
NVD Description
Windows Telephony Service Remote Code Execution Vulnerability
Deeper analysisAI
CVE-2025-21409 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, indicating a heap-based buffer overflow with insufficient additional details from NVD-CWE.
The vulnerability can be exploited by a remote unauthenticated attacker over the network with low attack complexity, though it requires user interaction such as clicking a malicious link or file. Successful exploitation enables the attacker to achieve high impacts on confidentiality, integrity, and availability, allowing arbitrary code execution on the targeted Windows system.
Microsoft's update guide provides details on mitigation, available at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21409.
Details
- CWE(s)