What is CVE-2025-20740?

CVE-2025-20740 is a medium-severity vulnerability in Mediatek Mt7902, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 4.7/10. Published 2025-11-04.

How severe is CVE-2025-20740?

Medium severity. CVSS v3 base score is 4.7 out of 10.

Vulnerability in Mediatek Mt7902

CVE-2025-20740

In wlan STA driver, there is a possible out of bounds read due to a race condition. This could lead to local information disclosure with User execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00435337; Issue ID: MSV-4036.

Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)

Published 2025-11-04 · last modified 2026-10-18.

CVSS v3 metric

CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.001 (0.9th percentile), scored 2026-10-22.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 1st percentile — 0.9% 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 Software Development Kit
Mediatek, Inc. Mt7902, Mt7920, Mt7921, Mt7922, Mt7925, Mt7927 — versions NB SDK release 3.7 and before

Weakness classification (CWE)

CWE-367 — Time-of-check Time-of-use (TOCTOU) Race Condition

References

corp.mediatek.com/product-security-bulletin/November-2025 (Vendor Advisory)

Frequently asked questions

What is CVE-2025-20740?: CVE-2025-20740 is a medium-severity vulnerability in Mediatek Mt7902, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 4.7/10. Published 2025-11-04.
How severe is CVE-2025-20740?: Medium severity. CVSS v3 base score is 4.7 out of 10.