Unrated severityNVD Advisory· Published Feb 3, 2022· Updated Nov 4, 2025
CVE-2020-5953
CVE-2020-5953
Description
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).
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
2- InsydeH2O/UEFI Firmwaredescription
Patches
Vulnerability mechanics
No source-code context for this CVE — mechanics is only generated when we can read the actual fix diff. Without that, the four sections (root cause, attack vector, affected code, fix) would be speculation rather than analysis.
References
4- cert-portal.siemens.com/productcert/pdf/ssa-306654.pdfmitrex_refsource_CONFIRM
- security.netapp.com/advisory/ntap-20220222-0005/mitrex_refsource_CONFIRM
- www.insyde.com/productsmitrex_refsource_MISC
- www.insyde.com/security-pledgemitrex_refsource_MISC
News mentions
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