Unauthenticated adjacent privilege escalation via incorrect bounds check
Published Mar 2, 2026 · Updated Mar 2, 2026
Out-of-bounds write in MediaTek WLAN AP Firmware SDK 7.6.7.3 and earlier allows remote attackers to escalate privileges from adjacent networks. The WLAN subcomponent applies an incorrect bounds check before a memory write; MediaTek has not disclosed the affected routine or input field. Exploitation requires adjacent-network reach but no authentication, prior execution privileges, or user interaction; success grants elevated firmware privileges.
Summary
What happened
Out-of-bounds write in MediaTek WLAN AP Firmware SDK 7.6.7.3 and earlier allows remote attackers to escalate privileges from adjacent networks. The WLAN subcomponent applies an incorrect bounds check before a memory write; MediaTek has not disclosed the affected routine or input field. Exploitation requires adjacent-network reach but no authentication, prior execution privileges, or user interaction; success grants elevated firmware privileges.
The record
- CVE
- CVE-2026-20430
- Published
- Mar 2, 2026
- Updated
- Mar 2, 2026
- Vendor
- MediaTek
- Product
- MediaTek WLAN AP Firmware
- Classifications
- CWE-787
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 2, 2026CVE publishedPublication date reported by the CVE source.
- Mar 2, 2026Record 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 7.6.7.3 and before / openWRT 19.07, 21.02, 23.05
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
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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