CVE-2025-20728

Local privilege escalation via incorrect heap bounds check

Published Nov 4, 2025 · Updated Nov 4, 2025

Heap-based buffer overflow in MediaTek WLAN STA Driver NB SDK release 3.7 and earlier allows local users to escalate privileges. The WLAN STA driver applies an incorrect bounds check before a write, permitting data to extend beyond a heap buffer. Exploitation requires local user execution privileges and no user interaction; MediaTek has not disclosed the triggering input or code locus.

CVSS severity7.8
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in MediaTek WLAN STA Driver NB SDK release 3.7 and earlier allows local users to escalate privileges. The WLAN STA driver applies an incorrect bounds check before a write, permitting data to extend beyond a heap buffer. Exploitation requires local user execution privileges and no user interaction; MediaTek has not disclosed the triggering input or code locus.

The record

CVE
CVE-2025-20728
Published
Nov 4, 2025
Updated
Nov 4, 2025
Vendor
MediaTek
Product
MediaTek WLAN STA Driver
Classifications
CWE-787, CWE-122, T1068
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

7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-787Out-of-bounds Write
CWE-122Heap-based Buffer Overflow
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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