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 23.7% 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).
Deeper analysis
CVE-2025-21248 is a remote code execution vulnerability in the Windows Telephony Service, carrying a CVSS 3.1 score of 8.8. The flaw is associated with CWE-122 and permits an attacker to execute arbitrary code on an affected system when certain conditions are met.
An unauthenticated remote attacker can exploit the issue over the network with low attack complexity and no privileges required, provided the victim performs a user interaction such as visiting a malicious webpage or opening a crafted file. Successful exploitation grants full confidentiality, integrity, and availability impact on the target host.
Microsoft has published guidance for the vulnerability in its Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21248, which includes details on available patches and recommended mitigations. The associated EPSS score remains low, with a current value of 0.0091 and a recorded peak of 0.0121.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-2314
Vulnerability details
Windows Telephony Service Remote Code Execution Vulnerability
- CWE(s)
Related Threats
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.
CVEs Like This One
Affected Assets
Mitigating Controls
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.