CVE-2025-21407: microsoft windows_10_1507 Heap-based Buffer Overflow

Vulnerability summary

CVE-2025-21407 is a high (CVSS 8.8) Heap-based Buffer Overflow vulnerability in microsoft windows_10_1507. EPSS estimates a 1.83% chance of exploitation in the next 30 days, higher than 78.5% of scored vulnerabilities.

Timeline

1. 11-02-2025
   PublishedVulnerability first disclosed.
2. 26-02-2026
   Last modifiedVulnerability information updated.

Description

Windows Telephony Service Remote Code Execution Vulnerability

• CWE-122Heap-based Buffer OverflowA heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().