CVE-2026-66334

MediumCVSS 6.8/10Last modified Nov 13, 2026

Description

AMI APTIOV contains vulnerabilities in BIOS where privileged users may cause the “Out-of-Bounds Write” by local access. Successful exploitation of this vulnerability may lead to a denial of service during firmware update processing, such as a crash or failed update if the out-of-bounds write hits unmapped memory. It could also impact Integrity, and Availability.

Metrics

CVSS 4.0 6.8/10

CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Weakness enumeration

CWE-787

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

Vendor	Product	Versions
AMI	AptioV	>= AptioV_5.0, < AptioV_5.046

References

https://go.ami.com/hubfs/Security%20Advisories/2026/AMI-SA-2026003.pdf

Timeline

Published: Nov 10, 2026
Last modified: Nov 13, 2026
NVD status: Awaiting Analysis

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