CVE-2025-21222: microsoft windows_10_1507 Heap-based Buffer Overflow

Vulnerability summary

CVE-2025-21222 is a high (CVSS 8.8) Heap-based Buffer Overflow vulnerability in microsoft windows_10_1507. EPSS estimates a 1.36% chance of exploitation in the next 30 days, higher than 71.2% of scored vulnerabilities.

Timeline

1. 08-04-2025
   PublishedVulnerability first disclosed.
2. 10-08-2026
   Last modifiedVulnerability information updated.

Description

Heap-based buffer overflow in Windows Telephony Service allows an unauthorized attacker to execute code over a network.

• 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().