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CVE-2026-20430

HIGH CVSS 3.1: 8.8 EPSS 0.02%
Updated Mar 02, 2026
Mediatek
Parameter Value
CVSS 8.8 (HIGH)
Affected Versions before 7.6.7.3
Type CWE-787 (Out-of-bounds Write)
Vendor Mediatek
Public PoC No

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.

Attack Parameters

Attack Vector
Adjacent
Requires local network access
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service

CVSS Vector v3.1

Weakness Type (CWE)

Vulnerable Products 9

Configuration From (including) Up to (excluding)
Mediatek Software_Development_Kit
cpe:2.3:a:mediatek:software_development_kit:*:*:*:*:*:*:*:*
<= 7.6.7.3
Openwrt Openwrt
cpe:2.3:o:openwrt:openwrt:19.07.0:-:*:*:*:*:*:*
Openwrt Openwrt
cpe:2.3:o:openwrt:openwrt:21.02.0:-:*:*:*:*:*:*
Openwrt Openwrt
cpe:2.3:o:openwrt:openwrt:23.05.0:-:*:*:*:*:*:*
Mediatek Mt6890
cpe:2.3:h:mediatek:mt6890:-:*:*:*:*:*:*:*
Mediatek Mt7915
cpe:2.3:h:mediatek:mt7915:-:*:*:*:*:*:*:*
Mediatek Mt7916
cpe:2.3:h:mediatek:mt7916:-:*:*:*:*:*:*:*
Mediatek Mt7981
cpe:2.3:h:mediatek:mt7981:-:*:*:*:*:*:*:*
Mediatek Mt7986
cpe:2.3:h:mediatek:mt7986:-:*:*:*:*:*:*:*