What is CVE-2021-43613?

CVE-2021-43613 is a medium-severity vulnerability in Insyde Software Insydeh2o, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 6.5/10. Published 2026-09-03.

How severe is CVE-2021-43613?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Insyde Software Insydeh2o

CVE-2021-43613

An issue was discovered in SysPasswordDxe in Insyde InsydeH2O. User and administrator password hashes are exposed in runtime UEFI variables, leading to escalation of privilege

Published 2026-09-03 · last modified 2026-09-03.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.001 (0.4th percentile), scored 2026-10-19.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 0th percentile — 0.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: -0.000

Affected products

Insyde Software Insydeh2o — versions See in the Solution

Weakness classification (CWE)

CWE-732 — Incorrect Permission Assignment for Critical Resource

References

8338d8cb-57f7-4252-abc0-96fd13e98d21

Frequently asked questions

What is CVE-2021-43613?: CVE-2021-43613 is a medium-severity vulnerability in Insyde Software Insydeh2o, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 6.5/10. Published 2026-09-03.
How severe is CVE-2021-43613?: Medium severity. CVSS v3 base score is 6.5 out of 10.