CVE-2021-33834

HIGH EPSS 8.5%
Published Sep 8, 20232y ago · Modified Jun 17, 20262w ago
7.1 CVSS 3.1
High
Find Similar
Published Sep 8, 2023 2y ago
Last Modified Jun 17, 2026 2w ago

Description

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.

CVSS Details

Base Score
7.1
Exploitability
1.8
Impact
5.2
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
8.5% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-787 Out-of-bounds Write Memory Safety

Affected Products 2

VendorProductVersionRange
insydeh2offt6.20.00any
insydeiscflashx64.sys3.9.3.0any

References 2

  • insyde.com https://www.insyde.com/security-pledge
    Not Applicable
  • insyde.com https://www.insyde.com/security-pledge/SA-2021004
    Vendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.