What is CVE-2023-22616?

CVE-2023-22616 is a high-severity vulnerability in Insyde Insydeh2o, classified under Externally Controlled Reference to a Resource in Another Sphere. CVSS score: 7.8/10. Published 2023-04-12.

How severe is CVE-2023-22616?

High severity. CVSS v3 base score is 7.8 out of 10.

Vulnerability in Insyde Insydeh2o

CVE-2023-22616

An issue was discovered in Insyde InsydeH2O with kernel 5.2 through 5.5. The Save State register is not checked before use. The IhisiSmm driver does not check the value of a save state register before use. Due to insufficient input validation, an attacker can corrupt SMRAM.

Published 2023-04-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (28.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 28.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Insyde Insydeh2o

Weakness classification (CWE)

CWE-610 — Externally Controlled Reference to a Resource in Another Sphere

References

www.insyde.com/security-pledge (Vendor Advisory)
research.nccgroup.com/2023/04/11/stepping-insyde-system-management-mode/ (Exploit, Third Party Advisory)
www.insyde.com/security-pledge/SA-2023022 (Vendor Advisory)

Frequently asked questions

What is CVE-2023-22616?: CVE-2023-22616 is a high-severity vulnerability in Insyde Insydeh2o, classified under Externally Controlled Reference to a Resource in Another Sphere. CVSS score: 7.8/10. Published 2023-04-12.
How severe is CVE-2023-22616?: High severity. CVSS v3 base score is 7.8 out of 10.