CVE-2025-20714

Local privilege escalation via WLAN stack overflow

Published Oct 14, 2025 · Updated Oct 14, 2025

Stack overflow in the MediaTek WLAN AP driver on affected chipsets allows local users with System privilege to elevate privileges. The driver applies an incorrect bounds check before writing to a stack buffer, allowing an out-of-bounds write; MediaTek has not disclosed the affected function or input. Exploitation requires existing System privilege and no user interaction, and successful exploitation grants higher local privilege in the driver context.

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

Stack overflow in the MediaTek WLAN AP driver on affected chipsets allows local users with System privilege to elevate privileges. The driver applies an incorrect bounds check before writing to a stack buffer, allowing an out-of-bounds write; MediaTek has not disclosed the affected function or input. Exploitation requires existing System privilege and no user interaction, and successful exploitation grants higher local privilege in the driver context.

The record

CVE
CVE-2025-20714
Published
Oct 14, 2025
Updated
Oct 14, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, CWE-121, T1068
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Oct 14, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 14, 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 privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

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.

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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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-121Stack-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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