What is CVE-2026-20430?

CVE-2026-20430 is a high-severity vulnerability in Mediatek Mt6890, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2026-03-02.

How severe is CVE-2026-20430?

High severity. CVSS v3 base score is 8.8 out of 10.

Buffer overflow in Mediatek Mt6890

CVE-2026-20430

In wlan AP FW, 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 f…

Vulnerability class: Buffer Overflow

EPSS: 0.002 (13.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Mediatek Mt6890
Mediatek Mt7915
Mediatek Mt7916
Mediatek Mt7981
Mediatek Mt7986
Mediatek Software_development_kit
Mediatek, Inc. Mediatek Chipset — versions MT6890, MT7915, MT7916
Openwrt — versions 19.07.0, 21.02.0, 23.05.0

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

security@mediatek.com (Vendor Advisory)

Frequently asked questions

What is CVE-2026-20430?: CVE-2026-20430 is a high-severity vulnerability in Mediatek Mt6890, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2026-03-02.
How severe is CVE-2026-20430?: High severity. CVSS v3 base score is 8.8 out of 10.