CVE-2023-22615

SMRAM corruption via unchecked RCX address

Published Apr 11, 2023 · Updated Feb 11, 2025

Out-of-bounds write in IhisiServicesSmm in Insyde InsydeH2O kernel 5.0 through 5.5 allows local users to corrupt SMRAM. The handler accepts an RCX save-state address that can overlap SMRAM and performs the subfunction write through that unchecked pointer. Low-privilege local access and high attack complexity are required; Insyde does not further characterize the resulting availability effect.

CVSS severity6.4
Medium
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 IhisiServicesSmm in Insyde InsydeH2O kernel 5.0 through 5.5 allows local users to corrupt SMRAM. The handler accepts an RCX save-state address that can overlap SMRAM and performs the subfunction write through that unchecked pointer. Low-privilege local access and high attack complexity are required; Insyde does not further characterize the resulting availability effect.

The record

CVE
CVE-2023-22615
Published
Apr 11, 2023
Updated
Feb 11, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 11, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 11, 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

6.4Insyde SoftwareCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:L
8.4CISA ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/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 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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