Buffer overflow in Mediatek Mt6890
CVE-2025-20685
In wlan AP driver, there is a possible out of bounds write due to an incorrect bounds check. This could lead to remote (proximal/adjacent) code execution with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00416226; Issue ID: MSV-3409.
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 (25.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 25.6% 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 Mt7915
- Mediatek Mt7916
- Mediatek Mt7981
- Mediatek Mt7986
- Mediatek Software Development Kit
- Mediatek, Inc. Mt6890, Mt7915, Mt7916, Mt7981, Mt7986 — versions SDK release 7.6.7.2 and before / OpenWrt 19.07, 21.02 (MT6890)
- Openwrt — versions 19.07.0, 21.02.0
Weakness classification (CWE)
References
- corp.mediatek.com/product-security-bulletin/July-2025 (Vendor Advisory)
Frequently asked questions
- What is CVE-2025-20685?
- CVE-2025-20685 is a high-severity vulnerability in Mediatek Mt6890, classified under Heap-based Buffer Overflow. CVSS score: 8.8/10. Published 2025-07-08.
- How severe is CVE-2025-20685?
- High severity. CVSS v3 base score is 8.8 out of 10.