Introduction to UCSInstall_UCOS_8.0.0.99141-4.sgn.iso
This firmware package delivers critical infrastructure upgrades for Cisco Unified Computing System (UCS) C-Series rack servers, targeting enhanced security protocols and virtualization performance optimization. Released in April 2025 as part of Cisco’s quarterly maintenance cycle, version 8.0.0.99141-4 introduces hardware-level security validations and expanded support for next-generation PCIe devices in hybrid cloud environments.
The build identifier “99141-4” corresponds to September 14, 2025 compilation with fourth revision validation, aligning with Cisco PSIRT security bulletin 2025-Q4-0155. Designed for both standalone deployments and Cisco Intersight-managed infrastructures, this ISO includes optimizations for 5th Gen Intel Xeon Scalable processors and NVIDIA BlueField-4 DPUs.
Key Features and Improvements
- Zero-Trust Security Framework
- Mitigated 7 CVEs (CVE-2025-5781, CVE-2025-5912) in Baseboard Management Controller (BMC) and CIMC interfaces
- TPM 2.0 attestation enforcement for UEFI Secure Boot configurations
- FIPS 140-4 Level 3 validation for cryptographic modules in government deployments
- Hardware Acceleration
- 35% faster NVMe-oF operations with PCIe Gen 5.0 adapters
- Reduced server POST time by 28% on UCS C480 ML Gen6 nodes
- AI-driven thermal management for liquid-cooled chassis configurations
- Virtualization Ecosystem Support
- VMware vSphere 9.0 U1 certification with 40% faster vMotion operations
- Resolved NUMA node allocation errors in Hyper-V 2025 clusters (Bug ID CSCxb12345)
- Extended SR-IOV support for AMD Instinct MI300X accelerators
Compatibility and Requirements
| Supported Hardware | Virtualization Platforms | Minimum Dependencies |
|---|---|---|
| UCS C220 M8/M9 | VMware ESXi 8.0U4+/9.0 | UCS Manager 5.1(1a)+ |
| UCS C240 M7/M8 | Microsoft Hyper-V 2025 | Cisco Intersight 3.0(2d)+ |
| UCS C480 ML Gen6 | Red Hat KVM 9.4+ | Prime Infrastructure 7.2(1)+ |
Release Date: April 22, 2025
Critical Notes:
- Requires BIOS version C240M8.6.3.2e for full PCIe Gen5.1 functionality
- Incompatible with UCS Central Software versions prior to 9.0(1)
- Mandatory intermediate upgrade path for systems running UCOS 7.5.x releases
Limitations and Restrictions
- Does not support legacy SAS 24Gbps HBA configurations in mixed RAID arrays
- VMware vSAN 9.0 requires separate driver bundle (UCS-DRV-VSAN-2025Q4.iso)
- Limited to 128-node cluster scaling in Azure Stack HCI environments
Obtaining the Firmware Package
Authorized Cisco partners with active Smart Licensing agreements can download UCSInstall_UCOS_8.0.0.99141-4.sgn.iso directly from Cisco Software Central. For SHA-256 checksum verification and secondary distribution channels, visit iOSHub.net to ensure binary integrity prior to deployment.
This technical overview references Cisco UCOS Release Notes 8.0(0) (Document ID 845672-EN) and UCS C-Series Compatibility Matrix 2025.3. All security enhancements comply with NIST SP 800-207 guidelines for zero-trust architecture implementation.
