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  4. CVE 2026 66335 heap overflow in smivariable smm handler
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Back to active CVEs
Medium · CVSS 6.8CVE-2026-66335

Heap Overflow in SmiVariable SMM HandlerCVE-2026-66335

Answer in brief

CVE-2026-66335 records a Medium severity (CVSS 6.8) vulnerability in Heap Overflow in SmiVariable SMM Handler. The current sources do not mark it as known exploited. The current feed maps AMI/AptioV (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 10, 2026Updated Nov 10, 2026Source checked Nov 10, 2026First seen by HOL Nov 10, 2026Material review Nov 10, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 6.8
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 6.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps AMI/AptioV (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
AMI/AptioVgeneric>=AptioV_5.0 <AptioV_5.045AptioV_5.045

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for AMI/AptioV.
  2. 2Review the reported fix. Update AMI/AptioV to AptioV_5.045 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 10, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 10, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 10, 2026

Sources and claim methodology

  • Source referencego.ami.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • OOB-Read in FmpCapsuleUpdateSame ami/aptiov package
  • OFBD SMM Read Validation IssuesSame ami/aptiov package
  • OFBD SMM Write Validation IssuesSame ami/aptiov package

Record context

Vulnerability class
Buffer Overflow
EPSS
Not reported
CWE IDs
Not reported
Source
CVE List V5
Source checked
Nov 10, 2026
References
1 linked source
Open source record