What is CVE-2023-22612?

CVE-2023-22612 is a high-severity vulnerability in Insyde Insydeh2o, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2023-04-11.

How severe is CVE-2023-22612?

High severity. CVSS v3 base score is 8.8 out of 10.

Buffer overflow in Insyde Insydeh2o

CVE-2023-22612

An issue was discovered in IhisiSmm in Insyde InsydeH2O with kernel 5.0 through 5.5. A malicious host OS can invoke an Insyde SMI handler with malformed arguments, resulting in memory corruption in SMM.

Vulnerability class: Buffer Overflow

Published 2023-04-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.002 (12.5th percentile), scored 2026-10-08.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 12th percentile — 12.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Insyde Insydeh2o — versions 05.0a.11, 05.18.03, 05.28.03

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

www.insyde.com/security-pledge (Vendor Advisory)
research.nccgroup.com/2023/04/11/stepping-insyde-system-management-mode/ (Not Applicable)
www.insyde.com/security-pledge/SA-2023019 (Vendor Advisory)

Frequently asked questions

What is CVE-2023-22612?: CVE-2023-22612 is a high-severity vulnerability in Insyde Insydeh2o, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2023-04-11.
How severe is CVE-2023-22612?: High severity. CVSS v3 base score is 8.8 out of 10.