Home/CVE/A vulnerability exists in System Management Interrupt (SWSMI) handler of InsydeH2O UEFI Firmware code located in SWSMI h
CVE

CVE-2020-5953

A vulnerability exists in System Management Interrupt (SWSMI) handler of InsydeH2O UEFI Firmware code located in SWSMI h

A vulnerability exists in System Management Interrupt (SWSMI) handler of InsydeH2O UEFI Firmware code located in SWSMI handler that dereferences gRT (EFI_RUNTIME_SERVICES) pointer to call a GetVariable service, which is located outside of SMRAM. This can result in code execution in SMM (escalating privilege from ring 0 to ring -2).

HIGH · CVSS 7.5 EPSS 0.00066
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
▤

Affected Products & Versions

17
insyde insydeh2oall versions
siemens ruggedcom ape1808 firmwareall versions
siemens simatic field pg m6 firmwareall versions
siemens simatic ipc127e firmwareall versions
siemens simatic ipc227g firmwareall versions
siemens simatic ipc277g firmwareall versions
siemens simatic itp1000 firmwareall versions
siemens simatic ipc477e pro firmwareall versions
▣

Scoring & Timeline

7.5
HIGH · 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 NVD03 Feb 2022 · 01:15 AM
CVSS VectorCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
⚑

Vendor Advisories

1
siemens-csafSSA-306654
🔗

References & Sources

5
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-20220222-0005/Third Party Advisory
https://www.insyde.com/productsProductVendor Advisory
https://www.insyde.com/security-pledgeVendor Advisory
https://www.kb.cert.org/vuls/id/796611
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