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AMD Security Bulletin AMD-SB-3033, August 2026

Supermicro is aware of a potential vulnerability in SEV-SNP that could potentially enable arbitrary code execution on the AMD Security Processor under certain conditions. This vulnerability affects BIOS in Supermicro H12, H13 and H14 products.

Findings:

An arbitrary code execution flaw was identified on the AMD Security Processor (ASP) that could be re‑exposed by rolling back the firmware to a version predating the 2024 security patch. The attack requires physical access and falls outside the SEV-SNP threat model. AMD is providing defense-in-depth mitigations for this issue.

Affected products:

Supermicro BIOS on server H12, H13 and H14 motherboards.

AMD Motherboard GenerationBIOS Version with the fix
H12 – H12SSW-AN6 – EPYC™ 7002/7003 seriesv 3.5
H12 – H12SSW-iNR/NTR – EPYC 7002/7003 seriesv 3.6
H12 – H12SSW-iNL/NTL – EPYC 7002/7003 seriesv 3.6
H12 – H12DSG-O-CPU – EPYC 7002/7003 seriesv 3.6
H12 – H12DST-B – EPYC 7002/7003 seriesv 3.6
H12 – H12SST-PS – EPYC 7002/7003 seriesv 3.6
H12 – H12SSW-iN/NT – EPYC 7002/7003 seriesv 3.6
H12 – BH12SSi-M25 – EPYC 7002/7003 seriesv 3.6
H12 – H12DSU-iN – EPYC 7002/7003 seriesv 3.6
H12 – H12SSFF-AN6 – EPYC 7002/7003 seriesv 3.6
H12 – H12SSL-i/C/CT/NT – EPYC 7002/7003 seriesv 3.6
H12 – H12DSi-N6/NT6 – EPYC 7002/7003 seriesv 3.6
H12 – H12SSFR-AN6 – EPYC 7002/7003 seriesv 3.6
H12 – H12DSG-Q-CPU6 – EPYC 7002/7003 seriesv 3.6
H12 – H12SSG-AN6 – EPYC 7002/7003 seriesv 3.6
H12 – H12DGQ-NT6 – EPYC 7002/7003 seriesv 3.6
H12 – H12SSG-ANP6– EPYC 7002/7003 seriesv 3.6
H12 – H12DGO-6 – EPYC 7002/7003 seriesv 3.6
H12 – H12DSU-iNR – EPYC 7002/7003 seriesv 3.6
H13 – H13SVW-N/NT – EPYC 8004 seriesv 2.1
H13 – H13SSW – EPYC 9004/9005 seriesv 3.8
H13 – H13DSH – EPYC 9004/9005 seriesv 3.8a
H13 – H13DSG-O-CPU – EPYC 9004/9005 seriesv 3.9
H13 – H13SST-G/GC – EPYC 9004/9005 seriesv 3.7
H13 – H13SSL-N/NT – EPYC 9004/9005 seriesv 3.8
H13 – H13SSH – EPYC 9004/9005 seriesv 3.9
H13 – H13SSH-E – EPYC 9004/9005 seriesv 3.9
H13 – H13DSG-O-CPU-D – EPYC 9004 seriesv 3.8a
H13 – H13SSF – EPYC 9004/9005 seriesv 3.8
H13 – H13DSG-OM – EPYC 9004/9005 seriesv 3.9
H14 – H14DSH – EPYC 9004/9005 seriesv 1.8a
H14 – H14SST-G – EPYC 9004/9005 seriesv 1.9
H14 – H14SST-GE – EPYC 9005 seriesv 1.1b
H14 – H14DSG-OD – EPYC 9004/9005 seriesv 1.9
H14 – H14SHM – EPYC 9004/9005 seriesv 1.8
H14 – H14DST-F/FL – EPYC 9005 seriesv 1.8
H14 – H14DSG-O-CPU – EPYC 9004/9005 seriesv 1.8
H14 – H14SSL-N/NT – EPYC 9004/9005 seriesv 2.0
H14 – H14DSG-OM – EPYC 9004/9005 seriesv 1.3
H14 – H14SSF – EPYC 9005 seriesv 1.0

Remediation:

  • All affected Supermicro motherboard SKUs will require a BIOS update to mitigate this potential vulnerability.
  • Updated BIOS firmware has been created to mitigate this potential vulnerability. Supermicro is currently testing and validating affected products. Please check Release Notes for the resolution.

Resources: