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 ID: WCNCR00464377; Issue ID: MSV-4905.

Vulnerability class: Buffer Overflow

Published 2026-02-02 · last modified 2026-06-17.

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.

EPSS exploit prediction

EPSS: 0.002 (5.9th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 6th percentile — 5.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000

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

corp.mediatek.com/product-security-bulletin/February-2026 (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.