CVE-2020-27339
6.7 · MEDIUMOverview
CVE-2020-27339 is a medium-severity vulnerability affecting insyde insydeh2o. It was published on June 16, 2021 and has a CVSS 3.1 base score of 6.7 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 6.7, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.
Technical Description
In the kernel in Insyde InsydeH2O 5.x, certain SMM drivers did not correctly validate the CommBuffer and CommBufferSize parameters, allowing callers to corrupt either the firmware or the OS memory. The fixed versions for this issue in the AhciBusDxe, IdeBusDxe, NvmExpressDxe, SdHostDriverDxe, and SdMmcDeviceDxe drivers are 05.16.25, 05.26.25, 05.35.25, 05.43.25, and 05.51.25 (for Kernel 5.1 through 5.5).
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-2020-27339?
CVE-2020-27339 is a medium-severity vulnerability affecting insyde insydeh2o. It was published on June 16, 2021 and has a CVSS 3.1 base score of 6.7 (MEDIUM).
How severe is CVE-2020-27339?
This vulnerability has a CVSS 3.1 base score of 6.7, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2020-27339?
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-2020-27339?
CyberStrike's AI-powered security agents can automatically detect CVE-2020-27339 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.
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