Buffer overflow in Mediatek Mt6890
CVE-2025-20709
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) escalation of privilege with no additional execution privileges needed. User interaction is not need…
Vulnerability class: Buffer Overflow
EPSS: 0.003 (19.7th percentile) — read the EPSS interpretation.
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.
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
- security@mediatek.com (Vendor Advisory)
Frequently asked questions
- What is CVE-2025-20709?
- CVE-2025-20709 is a high-severity vulnerability in Mediatek Mt6890, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.8/10. Published 2025-10-14.
- How severe is CVE-2025-20709?
- High severity. CVSS v3 base score is 8.8 out of 10.