What is CVE-2026-20436?

CVE-2026-20436 is a medium-severity vulnerability in Mediatek Mt7902, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 6.7/10. Published 2026-03-02.

How severe is CVE-2026-20436?

Medium severity. CVSS v3 base score is 6.7 out of 10.

Buffer overflow in Mediatek Mt7902

CVE-2026-20436

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 if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: WCNCR00473802; Issue ID: MSV-5970.

Vulnerability class: Buffer Overflow

Published 2026-03-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.7 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.001 (2.0th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 2nd percentile — 2.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000

Affected products

Mediatek Mt7902
Mediatek Mt7920
Mediatek Mt7921
Mediatek Mt7922
Mediatek Mt7925
Mediatek Mt7927
Mediatek Mt8696
Mediatek Nbiot Sdk
Mediatek, Inc. Mediatek Chipset — versions MT7902, MT7920, MT7921

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

corp.mediatek.com/product-security-bulletin/March-2026 (Vendor Advisory)

Frequently asked questions

What is CVE-2026-20436?: CVE-2026-20436 is a medium-severity vulnerability in Mediatek Mt7902, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 6.7/10. Published 2026-03-02.
How severe is CVE-2026-20436?: Medium severity. CVSS v3 base score is 6.7 out of 10.