CVE-2026-20418 | BDVDB-2026-313326 Detail

MediaTekMediaTek chipset

Description#

In Thread, there is a possible out of bounds write due to a missing bounds check. This could lead to remote escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00465153; Issue ID: MSV-4927.

Impact#

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

Weaknesses#

CWE-787 Out-of-bounds Write

References#

https://corp.mediatek.com/product-security-bulletin/February-2026

Exploit#

No public exploit known

History#

Version 12026-02-02Record published in the CVE List.
Version 22026-03-30Most recent update recorded in the CVE List.

Published

Published: 2026-02-02
Last modified: 2026-03-30

Vendor information

Vendor: MediaTek
Product: MediaTek chipset

All MediaTek vulnerabilities

Score

9.8 Critical

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 29.5.

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
MT7931
Fixed
Not stated
Vulnerable
MT7933
Fixed
Not stated

Scoring System

CVSS v4.0

Not available

CVSS v3.1

9.8 Critical

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

Metric breakdown
Attack Vector	Network
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).