High severity · published Sep 8, 2023
CVE-2021-33834
An issue was discovered in iscflashx64.sys 3.9.3.0 in Insyde H2OFFT 6.20.00
7.1
CVSS
0.2%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 8% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
H2
H2offt · Insyde
6.20.00 · source: NVD
IS
Iscflashx64.sys · Insyde
3.9.3.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-33834
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-33834
Not Applicable
https://www.insyde.com/security-pledge
Vendor Advisory
https://www.insyde.com/security-pledge/SA-2021004
More from H2offt
7.8
CVE-2019-12532
Improper access control in the Insyde software tools may allow an authenticated user to potentially enable escalation of privilege, or information disclosure via local access