What is CVE-2026-20407?

CVE-2026-20407 is a critical-severity vulnerability in Mediatek Mt7902, classified under Out-of-bounds Write. CVSS score: 9.3/10. Published 2026-02-02.

How severe is CVE-2026-20407?

Critical severity. CVSS v3 base score is 9.3 out of 10.

Buffer overflow in Mediatek Mt7902

CVE-2026-20407

In wlan STA driver, there is a possible escalation of privilege due to a missing bounds check. This could lead to local escalation of privilege with User execution privileges needed. User interaction is not needed for exploitation. Patch I…

Vulnerability class: Buffer Overflow

EPSS: 0.002 (6.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.3 (Critical). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

Affected products

Mediatek Mt7902
Mediatek Mt7920
Mediatek Mt7921
Mediatek Mt7922
Mediatek Mt7925
Mediatek Mt7927
Mediatek Nbiot_sdk
Mediatek, Inc. Mediatek Chipset — versions MT7902, MT7920, MT7921

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

security@mediatek.com (Vendor Advisory)

Frequently asked questions

What is CVE-2026-20407?: CVE-2026-20407 is a critical-severity vulnerability in Mediatek Mt7902, classified under Out-of-bounds Write. CVSS score: 9.3/10. Published 2026-02-02.
How severe is CVE-2026-20407?: Critical severity. CVSS v3 base score is 9.3 out of 10.