CVE-2025-20742: mediatek, inc. mt6890, mt7603, mt7615, mt7622, mt7915, mt7916, mt7981, mt7986 Heap-based Buffer Overflow

Vulnerability summary

CVE-2025-20742 is a high (CVSS 8.0) Heap-based Buffer Overflow vulnerability in mediatek, inc. mt6890, mt7603, mt7615, mt7622, mt7915, mt7916, mt7981, mt7986. EPSS estimates a 0.30% chance of exploitation in the next 30 days, higher than 21.1% of scored vulnerabilities.

Timeline

1. 04-11-2025
   PublishedVulnerability first disclosed.
2. 26-02-2026
   Last modifiedVulnerability information updated.

Description

In wlan AP driver, there is a possible out of bounds write due to an incorrect bounds check. This could lead to remote (proximal/adjacent) escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00432680; Issue ID: MSV-3949.

• 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().
• CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.