CVE-2025-20738: mediatek, inc. mt6890, mt7615, mt7622, mt7663, mt7915, mt7916, mt7981, mt7986 Stack-based Buffer Overflow

Vulnerability summary

CVE-2025-20738 is a medium (CVSS 6.7) Stack-based Buffer Overflow vulnerability in mediatek, inc. mt6890, mt7615, mt7622, mt7663, mt7915, mt7916, mt7981, mt7986. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 4.4% 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 local escalation of privilege if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: WCNCR00435342; Issue ID: MSV-4039.

• CWE-121Stack-based Buffer OverflowA stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).
• CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.