Home/CVE/In the kernel in Insyde InsydeH2O 5.x, certain SMM drivers did not correctly validate the CommBuffer and CommBufferSize
CVE

CVE-2020-27339

In the kernel in Insyde InsydeH2O 5.x, certain SMM drivers did not correctly validate the CommBuffer and CommBufferSize

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).

MEDIUM · CVSS 6.7 EPSS 0.00056
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-20Improper Input Validation
▤

Affected Products & Versions

23
insyde insydeh2o>= 5.3 and < 5.34.44
insyde insydeh2o>= 5.2 and < 5.25.44
insyde insydeh2o>= 5.1 and < 5.16.25
insyde insydeh2o>= 5.4 and < 5.42.44
insyde insydeh2o>= 5.3 and < 5.35.25
insyde insydeh2o>= 5.2 and < 5.26.25
insyde insydeh2o>= 5.4 and < 5.43.25
siemens ruggedcom apr1808 firmwareall versions
▣

Scoring & Timeline

6.7
MEDIUM · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD16 Jun 2021 · 04:15 PM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
⚑

Vendor Advisories

1
siemens-csafSSA-306654
🔗

References & Sources

4
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdfThird Party Advisory
https://security.netapp.com/advisory/ntap-20220216-0005/Third Party Advisory
https://www.insyde.com/security-pledge/SA-2021001Vendor Advisory
https://www.kb.cert.org/vuls/id/796611
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