CVE-2026-66335

Heap Overflow in SmiVariable SMM Handler

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 “Heap-based Buffer Overflow” 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 Confidentiality,
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 “Heap-based Buffer Overflow” 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 Confidentiality, Integrity, and Availability.
Title Heap Overflow in SmiVariable SMM Handler
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'}

Subscriptions

No data.

Weaknesses

No weakness.

Sources

Status
PUBLISHED
Assigner
AMI
Published
Updated
Nov 13, 2026, 2:29 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