CVE-2025-20740

Local memory disclosure via WLAN driver race

Published Nov 4, 2025 · Updated Nov 4, 2025

Out-of-bounds read in MediaTek WLAN STA Driver NB SDK release 3.7 and earlier allows local users to disclose memory. A race in the WLAN station-mode driver permits an out-of-bounds read, but MediaTek does not identify the function or shared object whose state changes between check and use. User-level local execution is required, no user interaction is needed, and the reported consequence is confidentiality loss without integrity or availability impact.

CVSS severity4.7
Medium
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in MediaTek WLAN STA Driver NB SDK release 3.7 and earlier allows local users to disclose memory. A race in the WLAN station-mode driver permits an out-of-bounds read, but MediaTek does not identify the function or shared object whose state changes between check and use. User-level local execution is required, no user interaction is needed, and the reported consequence is confidentiality loss without integrity or availability impact.

The record

CVE
CVE-2025-20740
Published
Nov 4, 2025
Updated
Nov 4, 2025
Vendor
MediaTek
Product
MediaTek WLAN STA Driver
Classifications
CWE-367
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 4, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=NB SDK release 3.7 and before

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

MediaTek · MediaTek WLAN STA Driverversion=NB SDK release 3.7 and before

Published CVSS scores

4.7CISA-ADPCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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