CVE-2022-29277

Arbitrary firmware memory writes via unchecked pointers

Published Nov 15, 2022 · Updated Apr 30, 2025

Out-of-bounds write in InsydeH2O allows local users with high privileges to modify arbitrary system RAM and SMRAM through firmware calls. FwBlockServiceSmm performs incorrect pointer checks before certain SpiAccessLib operations, allowing a crafted destination to receive the byte 0xff outside the intended region. Exploitation requires local high privileges; the published consequence is arbitrary memory modification, not a specified persistence or code-execution outcome.

CVSS severity7.5
High
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in InsydeH2O allows local users with high privileges to modify arbitrary system RAM and SMRAM through firmware calls. FwBlockServiceSmm performs incorrect pointer checks before certain SpiAccessLib operations, allowing a crafted destination to receive the byte 0xff outside the intended region. Exploitation requires local high privileges; the published consequence is arbitrary memory modification, not a specified persistence or code-execution outcome.

The record

CVE
CVE-2022-29277
Published
Nov 15, 2022
Updated
Apr 30, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Nov 15, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 30, 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 privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5Insyde SoftwareCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
8.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
8.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/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.

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write

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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