CVE-2026-6484

Local code execution via unverified firmware volumes

Published Aug 12, 2026 · Updated Aug 12, 2026

Verified-boot failure in Insyde Software InsydeH2O UEFI allows local users to execute arbitrary code through unverified firmware volumes. The firmware boot chain does not authenticate certain firmware volumes before executing their contents, allowing modified volume code to run in the UEFI environment. Exploitation requires local high-privilege access on an affected x86 system; Insyde has not publicly identified the specific volumes or affected-version bounds.

CVSS severity8.2
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Verified-boot failure in Insyde Software InsydeH2O UEFI allows local users to execute arbitrary code through unverified firmware volumes. The firmware boot chain does not authenticate certain firmware volumes before executing their contents, allowing modified volume code to run in the UEFI environment. Exploitation requires local high-privilege access on an affected x86 system; Insyde has not publicly identified the specific volumes or affected-version bounds.

The record

CVE
CVE-2026-6484
Published
Aug 12, 2026
Updated
Aug 12, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-1277, T1542.001
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Aug 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.2InsydeCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1277Firmware Not Updateable
T1542.001Pre-OS Boot: System Firmware

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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