What’s Vulnerable › Vulnerabilities

CVE-2021-33834

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-09-08 · updated 2026-06-17
• Weakness: CWE-787

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.

Affected products

• Insyde H2Offt: 6.20.00
• Insyde Iscflashx64.Sys: 3.9.3.0

References

• https://www.insyde.com/security-pledge
• https://www.insyde.com/security-pledge/SA-2021004
• https://www.insyde.com/security-pledge
• https://www.insyde.com/security-pledge/SA-2021004

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