Medium severity · published Aug 3, 2026
CVE-2026-20466
In sec boot, there is a possible escalation of privilege due to a heap buffer overflow
6.1
CVSS
0.2%
EPSS
No
On KEV
Description
In sec boot, there is a possible escalation of privilege due to a heap buffer overflow. This could lead to local escalation of privilege, if an attacker has physical access to the device, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: AUTO00845351 (Note: For MT2737) / ALPS11072643 (Note: For MT6880, MT6890, MT6990); Issue ID: MSV-6929.
CVSS vector
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack vector
Physical
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 6% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MC
MediaTek chipset · MediaTek, Inc.
MT2737; MT6880; MT6890; MT6990 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-20466
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-20466
www.mediatek.com
https://www.mediatek.com/product-security-bulletin/August-2026
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