CVE-2025-20683

Local privilege escalation via WLAN bounds check

Published Jul 8, 2025 · Updated Jul 8, 2025

Out-of-bounds write in MediaTek WLAN AP drivers in SDK 7.6.7.2 and earlier allows local users to escalate privileges. A faulty bounds check permits a write beyond the intended buffer, but MediaTek has not disclosed the affected routine or input field. Exploitation requires User execution privileges on an affected chipset running the SDK or OpenWrt 19.07 or 21.02, without user interaction.

CVSS severity9.8
Critical
EPSS probability0.47%
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 write in MediaTek WLAN AP drivers in SDK 7.6.7.2 and earlier allows local users to escalate privileges. A faulty bounds check permits a write beyond the intended buffer, but MediaTek has not disclosed the affected routine or input field. Exploitation requires User execution privileges on an affected chipset running the SDK or OpenWrt 19.07 or 21.02, without user interaction.

The record

CVE
CVE-2025-20683
Published
Jul 8, 2025
Updated
Jul 8, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1068
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Jul 8, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 8, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
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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