CVE-2025-20686 | BDVDB-2026-285192 Detail

MediaTekMT6890, MT7915, MT7916, MT7981, MT7986

Description#

In wlan AP driver, there is a possible out of bounds write due to an incorrect bounds check. This could lead to remote (proximal/adjacent) code execution with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00415570; Issue ID: MSV-3404.

Impact#

Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact high. Attack vector: adjacent.

Weaknesses#

CWE-122 Heap-based Buffer Overflow

References#

https://corp.mediatek.com/product-security-bulletin/July-2025

Exploit#

No public exploit known

History#

Version 12025-07-08Record published in the CVE List.

Published

Published: 2025-07-08
Last modified: 2025-07-08

Vendor information

Vendor: MediaTek
Product: MT6890, MT7915, MT7916, MT7981, MT7986

All MediaTek vulnerabilities

Score

8.8 High

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 30.0.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Memory Corruption

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
SDK release 7.6.7.2 and before / OpenWrt 19.07, 21.02 (MT6890)
Fixed
Not stated

Scoring System

CVSS v4.0

Not available

CVSS v3.1

8.8 High

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Metric breakdown
Attack Vector	Adjacent
Attack Complexity	Low
Privileges Required	None
User Interaction	None
Scope	Unchanged
Confidentiality	High
Integrity	High
Availability	High

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).