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Based on the Cisco documentation at least below rack servers have CIMC secure boot enabled by default/the system automatically enables it after a firmware update.
| Server | CIMC secure boot enabled by default | Notes |
|---|---|---|
| Cisco UCS C220 M4/M5/M6 |  | |
| Cisco C240 M4/M5/M6 | | |
| Cisco C480 M5/C480 M5 ML | | |
| Cisco C225 M6 | | |
| Cisco C245 M6 | | |
| Cisco UCS C460 M4 |  | Automatically enabled after upgrade to CIMC firmware 2.2(3) or higher |
Resolution
Once CIMC secure boot has been enabled in these servers it is not possible to boot any OS other than a Cisco created OS with a valid Cisco OS signature.
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