Heap-based Buffer Overflow in Windows Telephony Service by Microsoft
CVE-2025-21221

8.8HIGH

Key Information:

Vendor
Microsoft
Status
Windows 10 Version 1809
Windows Server 2019
Windows Server 2019 (server Core Installation)
Windows Server 2022
Vendor
CVE Published:
8 April 2025

Summary

A vulnerability identified in the Windows Telephony Service enables attackers to exploit a heap-based buffer overflow, potentially allowing unauthorized users to execute arbitrary code across a network. This security flaw may facilitate unauthorized access to sensitive systems, highlighting the importance of timely updates and robust security measures.

Affected Version(s)

Windows 10 Version 1507 32-bit Systems 10.0.10240.0 < 10.0.10240.20978

Windows 10 Version 1607 32-bit Systems 10.0.14393.0 < 10.0.14393.7970

Windows 10 Version 1809 32-bit Systems 10.0.17763.0 < 10.0.17763.7137

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisory

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.