CVE-2021-33834
HIGHCVSS 7.1/10EPSS 0.19%
Last modified
CVE-2021-33834 is a high-severity vulnerability rated 7.1/10 on the CVSS scale. 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. EPSS estimates a 0.19% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Insyde | H2offt | 6.20.00 |
| Insyde | Iscflashx64.Sys | 3.9.3.0 |
References
- https://www.insyde.com/security-pledgeNot Applicable
- https://www.insyde.com/security-pledge/SA-2021004Vendor Advisory
- https://www.insyde.com/security-pledgeNot Applicable
- https://www.insyde.com/security-pledge/SA-2021004Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is 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.
How severe is CVE-2021-33834?
CVE-2021-33834 has a CVSS score of 7.1/10 (HIGH severity). The EPSS model estimates a 0.19% probability of exploitation in the next 30 days.
How do I fix CVE-2021-33834?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-33834?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST