CVE-2026-66334

OFBD SMM Write Validation Issues

Published Nov 10, 2026 CVSS 4.0 · 6.8 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

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History
Type Values Removed Values Added
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.
Title OFBD SMM Write Validation Issues
Weaknesses CWE-787
References
Metrics cvssV4_0

{'score': 6.8, 'vector': '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'}

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Weaknesses

Sources

Status
PUBLISHED
Assigner
AMI
Published
Updated
Nov 13, 2026, 2:30 PM
Reserved
Jul 24, 2026, 9:31 PM
Status
Awaiting Analysis
Published
Nov 10, 2026, 5:17 PM
Modified
Nov 13, 2026, 3:17 PM