CVE-2025-20720: mediatek, inc. mt6890, mt7603, mt7615, mt7622, mt7915, mt7916, mt7981, mt7986 Heap-based Buffer Overflow
Vulnerability summary
CVE-2025-20720 is a high (CVSS 8.8) Heap-based Buffer Overflow vulnerability in mediatek, inc. mt6890, mt7603, mt7615, mt7622, mt7915, mt7916, mt7981, mt7986. EPSS estimates a 0.26% chance of exploitation in the next 30 days, higher than 16.7% of scored vulnerabilities.
Timeline
- 14-10-2025PublishedVulnerability first disclosed.
- 26-02-2026Last modifiedVulnerability information updated.
Description
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 needed for exploitation. Patch ID: WCNCR00418954; Issue ID: MSV-3569.
CVSS metrics
2 scores · 2 sources · 1 version- NVDNIST8.8HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.26%
Chance of exploitation in the next 30 days
Percentile
17%
Versus all other CVEs
30-day change
0.00 pp
From 0.26% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-122Heap-based Buffer OverflowA heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
- CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.
Affected systems
Mediatek1 product
- software_development_kit≤ 7.6.7.2
Mediatek, inc.1 product
- mt6890, mt7603, mt7615, mt7622, mt7915, mt7916, mt7981, mt7986SDK release 7.6.7.2 and before / OpenWrt 19.07, 21.02 (MT6890)
Openwrt1 product
- openwrtEOL19.07.0 | 21.02.0
3 vendors · 3 products
References
1 links- corp.mediatek.com/product-security-bulletin/October-2025Vendor Advisory