CVE-2023-22613

SMM memory corruption via malformed RCX pointer

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 SMM memory. The SMI handler accepts a malformed pointer in RCX and writes through it even when the pointed range overlaps protected SMRAM. Low-privilege local code must invoke the handler; successful exploitation corrupts protected SMM state and disrupts firmware-controlled execution.

CVSS severity7.3
High
EPSS probability0.21%
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 SMM memory. The SMI handler accepts a malformed pointer in RCX and writes through it even when the pointed range overlaps protected SMRAM. Low-privilege local code must invoke the handler; successful exploitation corrupts protected SMM state and disrupts firmware-controlled execution.

The record

CVE
CVE-2023-22613
Published
Apr 11, 2023
Updated
Feb 11, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1068
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

7.3Insyde SoftwareCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:L
8.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/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

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1068Exploitation for Privilege Escalation

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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