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CVE-2026-66335

MEDIUMCVSS 6.8/10EPSS 0.11%

Last modified

CVE-2026-66335 is a medium-severity vulnerability rated 6.8/10 on the CVSS scale. 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.. EPSS estimates a 0.11% chance of exploitation in the next 30 days.

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.

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

EPSS Probability
0.11%

1.5th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
AMIAptioV>= AptioV_5.0, < AptioV_5.045

References

Timeline

Published
Last Modified
Status
Awaiting Analysis

Frequently Asked Questions

What is CVE-2026-66335?
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.
How severe is CVE-2026-66335?
CVE-2026-66335 has a CVSS score of 6.8/10 (MEDIUM severity). The EPSS model estimates a 0.11% probability of exploitation in the next 30 days.
How do I fix CVE-2026-66335?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST