CVE-2025-21221
Published: 08 April 2025
Summary
CVE-2025-21221 is a high-severity Heap-based Buffer Overflow (CWE-122) vulnerability in Microsoft Windows Server 2008. Its CVSS base score is 8.8 (High).
Operationally, ranked in the top 17.1% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
CVE-2025-21221 is a heap-based buffer overflow vulnerability, tracked under CWE-122, that affects the Windows Telephony Service. The flaw carries a CVSS 3.1 base score of 8.8 and permits remote code execution when triggered over a network.
An unauthorized attacker can exploit the issue remotely without authentication, though user interaction is required. Successful exploitation grants the attacker the ability to execute arbitrary code with high impact on confidentiality, integrity, and availability.
The single reference points to the Microsoft Security Response Center advisory for CVE-2025-21221, which is the authoritative source for official mitigation guidance and patch availability. The associated EPSS score remains low, with a current value of 0.0174 and a peak of 0.0205.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-10242
Vulnerability details
Heap-based buffer overflow in Windows Telephony Service allows an unauthorized attacker to execute code over a network.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.