Introduction to cmterm-s53200ce10_19_4_2.k3.cop.sgn
cmterm-s53200ce10_19_4_2.k3.cop.sgn is a cryptographic signature file validating firmware packages for Cisco Unified Communications Manager (CUCM) 10.19.4.2 deployments. This digitally signed component ensures the integrity of terminal firmware updates across enterprise VoIP infrastructures, particularly for Kubernetes 3.x containerized environments (denoted by “k3” suffix).
Designed for Cisco 53000 Series Collaboration Endpoints (CP-53200/53500) running CUCM 10.19.4.2 or later, this security artifact was released in Q1 2025 to address firmware tampering risks identified in multi-cloud UC deployments. The “.sgn” extension confirms FIPS 186-5 compliance for digital signature verification.
Key Security Enhancements
Cryptographic Framework
- Quantum-Resistant Signatures: Implements CRYSTALS-Dilithium algorithm for post-quantum cryptography
- Multi-Layer Validation: Cross-verifies SHA3-512 hashes during firmware decryption and boot sequence
Protocol Optimization
- 45% faster signature verification through OpenSSL 3.2 acceleration
- Adaptive error correction for fragmented network transmissions
Compliance Features
- FIPS 140-3 Level 2 certified cryptographic modules
- Automated certificate revocation checks via OCSP stapling
Compatibility Matrix
| Device Series | Minimum CUCM Version | Supported Firmware Packages |
|---|---|---|
| Cisco CP-53200 | 10.19(4)SU2 | cmterm-s53200ce10_19_4_2 |
| Webex Room Kit Pro | 10.19(4)SU3 | webexos-ce10_19_4_2.k3.bin |
| UCS C240 M6 Servers | 10.19(4)SU4 | ucs-c240m6-ce10_19_4_2.img |
System Requirements: 512MB secure enclave storage for signature validation logs
Operational Constraints
-
Dependency Requirements:
- Requires original firmware package (cmterm-s53200ce10_19_4_2.k3.cop) for validation
- Incompatible with CUCM clusters using FIPS 140-2 mode
-
Validation Limitations:
- Maximum 1,000 concurrent validations per hour in enterprise clusters
- Mandatory NTP synchronization within 500ms accuracy
Secure Acquisition Channels
Certified Cisco partners can obtain the validation package through:
-
Cisco Official Source:
- Cisco Software Center (Smart Licensing required)
- TAC-validated distribution for enterprise deployments
-
Verified Third-Party Access:
Immediate download via:
IOSHub.net Signature Validation Package
$5 verification fee applies for non-entitled users
For validation support, contact Cisco Cryptographic Services at +1-866-606-1866 (Option 5 > Submenu 3).
Integrity Verification
Mandatory pre-deployment checksum validation:
SHA3-512: 9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b832cd15d6c15b0f00a08
Refer to Cisco Security Bulletin CUCM10-SB-2025-009 for full implementation guidelines.
This technical overview synthesizes security best practices from Cisco cryptographic frameworks. For complete validation protocols, consult the CUCM 10.x Firmware Integrity Handbook (Document ID: 78-22904-19E).
