Buffer overflow in Mediatek Mt6890
CVE-2026-20408
In wlan, there is a possible out of bounds write due to a heap buffer overflow. 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: WCNCR00461651; Issue ID: MSV-4758.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.003 (16.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 17th percentile — 16.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: -0.000
Affected products
- Mediatek Mt6890
- Mediatek Mt7615
- Mediatek Mt7915
- Mediatek Mt7916
- Mediatek Mt7981
- Mediatek Mt7986
- Mediatek Software Development Kit
- Mediatek, Inc. Mediatek Chipset — versions MT6890, MT7615, MT7915
- Openwrt — versions 19.07.0, 21.02.0, 23.05.0
Weakness classification (CWE)
References
- corp.mediatek.com/product-security-bulletin/February-2026 (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-20408?
- CVE-2026-20408 is a high-severity vulnerability in Mediatek Mt6890, classified under Heap-based Buffer Overflow. CVSS score: 8.8/10. Published 2026-02-02.
- How severe is CVE-2026-20408?
- High severity. CVSS v3 base score is 8.8 out of 10.