CVE-2021-33626
7.8 · HIGHOverview
CVE-2021-33626 is a high-severity vulnerability affecting insyde insydeh2o. It was published on October 1, 2021 and has a CVSS 3.1 base score of 7.8 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.
Technical Description
A vulnerability exists in SMM (System Management Mode) branch that registers a SWSMI handler that does not sufficiently check or validate the allocated buffer pointer(QWORD values for CommBuffer). This can be used by an attacker to corrupt data in SMRAM memory and even lead to arbitrary code execution.
Remediation
Check the references section for vendor advisories and patches from insyde. Update insydeh2o to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| insyde | insydeh2o | >= 5.3, < 5.34.44 | Affected |
References
Frequently Asked Questions
What is CVE-2021-33626?
CVE-2021-33626 is a high-severity vulnerability affecting insyde insydeh2o. It was published on October 1, 2021 and has a CVSS 3.1 base score of 7.8 (HIGH).
How severe is CVE-2021-33626?
This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2021-33626?
Check the references section for vendor advisories and patches from insyde. Update insydeh2o to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2021-33626?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-33626 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
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Browser-based exploitation validates findings with real proof-of-concept.
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