What is CVE-2021-33834?

CVE-2021-33834 is a high-severity vulnerability in Insyde H2offt, classified under Out-of-bounds Write. CVSS score: 7.1/10. Published 2023-09-08.

How severe is CVE-2021-33834?

High severity. CVSS v3 base score is 7.1 out of 10.

Buffer overflow in Insyde H2offt

CVE-2021-33834

An issue was discovered in iscflashx64.sys 3.9.3.0 in Insyde H2OFFT 6.20.00. When handling IOCTL 0x22229a, the input used to allocate a buffer and copy memory is mishandled. This could cause memory corruption or a system crash.

Vulnerability class: Buffer Overflow

EPSS: 0.002 (8.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H.

Affected products

Insyde H2offt — versions 6.20.00
Insyde Iscflashx64.sys — versions 3.9.3.0
N/a — versions n/a

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

cve@mitre.org (Not Applicable)
cve@mitre.org (Vendor Advisory)

Frequently asked questions

What is CVE-2021-33834?: CVE-2021-33834 is a high-severity vulnerability in Insyde H2offt, classified under Out-of-bounds Write. CVSS score: 7.1/10. Published 2023-09-08.
How severe is CVE-2021-33834?: High severity. CVSS v3 base score is 7.1 out of 10.