Local privilege escalation via incorrect bounds check
Published Nov 4, 2025 · Updated Nov 4, 2025
Out-of-bounds write in MediaTek WLAN AP Driver on SDK 7.6.7.2 and earlier allows local users with System privilege to escalate privileges. The driver applies an incorrect bounds check before writing to a buffer, permitting an out-of-bounds write; MediaTek has not named the function or buffer. The affected range also includes OpenWrt 19.07 and 21.02; exploitation requires prior System privilege and no user interaction.
Summary
What happened
Out-of-bounds write in MediaTek WLAN AP Driver on SDK 7.6.7.2 and earlier allows local users with System privilege to escalate privileges. The driver applies an incorrect bounds check before writing to a buffer, permitting an out-of-bounds write; MediaTek has not named the function or buffer. The affected range also includes OpenWrt 19.07 and 21.02; exploitation requires prior System privilege and no user interaction.
The record
- CVE
- CVE-2025-20748
- Published
- Nov 4, 2025
- Updated
- Nov 4, 2025
- Vendor
- MediaTek
- Product
- MediaTek WLAN AP Driver
- Classifications
- CWE-787, T1068
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Nov 4, 2025CVE publishedPublication date reported by the CVE source.
- 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.
- Affected versionversion=SDK release 7.6.7.2 and before / openWRT 19.07, 21.02
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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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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