CVE-2022-30426Public exploit

Local privilege escalation via shared GetVariable size

Published Sep 22, 2022 · Updated Jul 9, 2026

Stack-based buffer overflow in Acer UEFI firmware allows local users to execute code in DXE via crafted NVRAM variables. TcgPlatformSetupPolicy reuses a DataSize value enlarged by the first GetVariable call when a second call writes into a smaller stack buffer. Low-privileged local access that can set the two variables enables control-flow hijacking and persistent firmware-level code execution across boots.

CVSS severity7.8
High
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in Acer UEFI firmware allows local users to execute code in DXE via crafted NVRAM variables. TcgPlatformSetupPolicy reuses a DataSize value enlarged by the first GetVariable call when a second call writes into a smaller stack buffer. Low-privileged local access that can set the two variables enables control-flow hijacking and persistent firmware-level code execution across boots.

The record

CVE
CVE-2022-30426
Published
Sep 22, 2022
Updated
Jul 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1542.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 22, 2022CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8CISA ADP VulnrichmentCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1542.001Pre-OS Boot: System Firmware

Public exploit references

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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