Buffer overflow in Insyde Software Insydeh2o

CVE-2021-43614

Error in handling the PlatformLangCodes UEFI variable could cause a buffer overflow, leading to resource exhaustion and failure.

Vulnerability class: Buffer Overflow

Published · last modified .

CVSS v3 metric

CVSS v3 base score 6.7 (Medium). Vector: CVSS:3.1/AV:P/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:L.

EPSS exploit prediction

EPSS: 0.001 (1.2th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 1st percentile — 1.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2021-43614: held from 0.001 to 0.001.

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

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2021-43614?
CVE-2021-43614 is a medium-severity vulnerability in Insyde Software Insydeh2o, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 6.7/10. Published 2026-09-03.
How severe is CVE-2021-43614?
Medium severity. CVSS v3 base score is 6.7 out of 10.