CVE-2022-40080Public exploit

Local UEFI code execution via stale GetVariable size

Published Feb 16, 2023 · Updated Mar 19, 2025

Stack overflow in Acer Aspire E5-475G BIOS firmware 1.21 allows local users to execute arbitrary code during the UEFI DXE phase. The FpGui function at offset 0x356A8 calls GetVariable twice for DataAddress after setting DataSize to 8, but neither resets the enlarged size nor checks it against the stack buffer. A low-privileged local user can supply an oversized DataAddress value, overwrite the stack frame, hijack control flow, and implant a persistent firmware backdoor.

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 overflow in Acer Aspire E5-475G BIOS firmware 1.21 allows local users to execute arbitrary code during the UEFI DXE phase. The FpGui function at offset 0x356A8 calls GetVariable twice for DataAddress after setting DataSize to 8, but neither resets the enlarged size nor checks it against the stack buffer. A low-privileged local user can supply an oversized DataAddress value, overwrite the stack frame, hijack control flow, and implant a persistent firmware backdoor.

The record

CVE
CVE-2022-40080
Published
Feb 16, 2023
Updated
Mar 19, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1542.001, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 16, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 19, 2025Record 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-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8NIST NVDCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
T1068Exploitation for Privilege Escalation

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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