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CVE-2026-20430

HIGH
8.8
CVSS Score
Published: March 2, 2026 at 08:39 AM UTC
Updated: June 17, 2026 at 10:17 AM UTC
2 products affected across 2 vendorsOpenWRTSoftware Development Kit

Using MT6890, MT7915, MT7916, MT7981, MT7986 by MediaTek, Inc.?

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Severity
HIGH8.8
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Software Development Kit· MediaTek
95%
v ≤ 7.6.7.3
mediatek-mt6890 (environment) · mediatek-mt7915 (environment) · mediatek-mt7916 (environment) · mediatek-mt7981 (environment) · mediatek-mt7986 (environment)
OpenWRT· Openwrt
95%
19.07.021.02.023.05.0
mediatek-mt6890 (environment) · mediatek-mt7915 (environment) · mediatek-mt7916 (environment) · mediatek-mt7981 (environment) · mediatek-mt7986 (environment)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: cverecord
https://corp.mediatek.com/product-security-bulletin/March-2026

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHCISA-ADP
Attack Vector
ADJACENT_NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-787

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