CVE-2026-20430

Out-of-Bounds Write in MediaTek Wireless Firmware Enables Privilege Escalation

Published Mar 2, 2026 CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
Description
In wlan AP FW, there is a possible out of bounds write due to an incorrect bounds check. This could lead to remote (proximal/adjacent) escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00467553; Issue ID: MSV-5151.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Title Out-of-Bounds Write in MediaTek Wireless Firmware Enables Privilege Escalation
Type Values Removed Values Added
First Time appeared Mediatek
Mediatek mt6890
Mediatek mt7915
Mediatek mt7916
Mediatek mt7981
Mediatek mt7986
Mediatek software Development Kit
Openwrt
Openwrt openwrt
CPEs cpe:2.3:a:mediatek:software_development_kit:*:*:*:*:*:*:*:*
cpe:2.3:h:mediatek:mt6890:-:*:*:*:*:*:*:*
cpe:2.3:h:mediatek:mt7915:-:*:*:*:*:*:*:*
cpe:2.3:h:mediatek:mt7916:-:*:*:*:*:*:*:*
cpe:2.3:h:mediatek:mt7981:-:*:*:*:*:*:*:*
cpe:2.3:h:mediatek:mt7986:-:*:*:*:*:*:*:*
cpe:2.3:o:openwrt:openwrt:19.07.0:-:*:*:*:*:*:*
cpe:2.3:o:openwrt:openwrt:21.02.0:-:*:*:*:*:*:*
cpe:2.3:o:openwrt:openwrt:23.05.0:-:*:*:*:*:*:*
Vendors & Products Mediatek
Mediatek mt6890
Mediatek mt7915
Mediatek mt7916
Mediatek mt7981
Mediatek mt7986
Mediatek software Development Kit
Openwrt
Openwrt openwrt
Type Values Removed Values Added
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description In wlan AP FW, there is a possible out of bounds write due to an incorrect bounds check. This could lead to remote (proximal/adjacent) escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00467553; Issue ID: MSV-5151.
Weaknesses CWE-787
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
MediaTek
Published
Updated
Mar 30, 2026, 1:05 PM
Reserved
Nov 3, 2025, 1:30 AM
Status
Analyzed
Published
Mar 2, 2026, 9:16 AM
Modified
Jun 17, 2026, 10:17 AM