What is CVE-2026-20456?

CVE-2026-20456 is a medium-severity vulnerability in Mediatek Mt7902, classified under Out-of-bounds Write. CVSS score: 5.5/10. Published 2026-06-01.

How severe is CVE-2026-20456?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Buffer overflow in Mediatek Mt7902

CVE-2026-20456

In wlan STA driver, there is a possible system crash due to a missing bounds check. This could lead to local denial of service with User execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00480851…

Vulnerability class: Buffer Overflow

EPSS: 0.000 (2.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Affected products

Mediatek Mt7902
Mediatek Mt7902_firmware
Mediatek Mt7920
Mediatek Mt7920_firmware
Mediatek Mt7921
Mediatek Mt7921_firmware
Mediatek Mt7922
Mediatek Mt7922_firmware
Mediatek Mt7925
Mediatek Mt7925_firmware

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

security@mediatek.com (Vendor Advisory)

Frequently asked questions

What is CVE-2026-20456?: CVE-2026-20456 is a medium-severity vulnerability in Mediatek Mt7902, classified under Out-of-bounds Write. CVSS score: 5.5/10. Published 2026-06-01.
How severe is CVE-2026-20456?: Medium severity. CVSS v3 base score is 5.5 out of 10.