CVE-2025-20737: mediatek, inc. mt6890, mt7615, mt7622, mt7663, mt7915, mt7916, mt7981, mt7986 Stack-based Buffer Overflow
Vulnerability summary
CVE-2025-20737 is a high (CVSS 7.8) Stack-based Buffer Overflow vulnerability in mediatek, inc. mt6890, mt7615, mt7622, mt7663, mt7915, mt7916, mt7981, mt7986. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 4.3% of scored vulnerabilities.
Timeline
- 04-11-2025PublishedVulnerability 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 local escalation of privilege with User execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00435343; Issue ID: MSV-4040.
CVSS metrics
2 scores · 2 sources · 1 version- NVDNIST7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.16%
Chance of exploitation in the next 30 days
Percentile
4%
Versus all other CVEs
30-day change
+0.01 pp
From 0.15% on 21-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-121Stack-based Buffer OverflowA stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).
- 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, mt7615, mt7622, mt7663, mt7915, mt7916, mt7981, mt7986Versions:SDK release 7.6.7.2 and before / openWRT 19.07, 21.02
Openwrt1 product
- openwrtEOL19.07.0 | 21.02.0
3 vendors · 3 products
References
1 links- corp.mediatek.com/product-security-bulletin/November-2025Vendor Advisory