CVE-2025-21248
Published: 14 January 2025
Summary
CVE-2025-21248 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 28.6% 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-10 (Information Input Validation) and SI-2 (Flaw Remediation).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
Requires identification, reporting, and timely remediation of the heap-based buffer overflow flaw in Windows Telephony Service via patching.
Mandates validation of untrusted inputs to the Telephony Service to prevent heap buffer overflows from malformed network data requiring user interaction.
Provides memory protections like ASLR and DEP to hinder successful exploitation of the heap-based buffer overflow for remote code execution.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Remote unauthenticated heap buffer overflow enabling arbitrary code execution in Windows Telephony Service directly maps to exploitation of remote services.
NVD Description
Windows Telephony Service Remote Code Execution Vulnerability
Deeper analysisAI
CVE-2025-21248 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 (Heap-based Buffer Overflow) and NVD-CWE-noinfo.
The vulnerability can be exploited remotely over the network by unauthenticated attackers requiring no privileges, though it demands user interaction. Successful exploitation enables arbitrary code execution in the context of the Telephony Service, resulting in high impacts to confidentiality, integrity, and availability.
Microsoft's update guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21248 provides details on patches and mitigation recommendations for addressing this issue.
Details
- CWE(s)