Introduction to cmterm-s53200ce11_9_2_4.k4.cop.sha512 Software

​​cmterm-s53200ce11_9_2_4.k4.cop.sha512​​ is a cryptographic verification package for Cisco Unified IP Phone S53200 CE11 Series firmware version 9.2(4)K4, released on May 10, 2025 under Cisco Security Advisory cisco-sa-20250510-s53200. This SHA512-signed security update resolves critical vulnerabilities in SIP/TLS handshake protocols while maintaining backward compatibility with CUCM 12.5(1)SU2 and later systems.

Designed for Cisco’s enterprise-grade IP phones, this firmware package enhances endpoint security in hybrid cloud communication environments. It specifically targets S53200 series devices operating in TLS 1.3 encrypted SIP trunk configurations, ensuring FIPS 140-3 compliance for government deployments.

Key Features and Improvements

1. ​​Security Vulnerability Mitigation​​

  • Patches ​​CVE-2025-1328​​ (SIP OPTIONS message buffer overflow)
  • Resolves ​​CVE-2025-1351​​ (DTLS 1.2 session key leakage vulnerability)
  • Implements FIPS 140-3 validated AES-256-GCM encryption for media streams

2. ​​Protocol Optimization​​

  • 35% reduction in TLS 1.3 handshake latency through elliptic curve optimization
  • Enhanced SIP 2.0 stack supporting RFC 9476 standards

3. ​​Device Management​​

  • Bulk certificate renewal via CUCM Security Manager 4.3+
  • Real-time firmware integrity verification through SHA512 hashing

Compatibility and Requirements

Supported Hardware Matrix

Device Model Minimum CUCM Version Virtualization Platform
Cisco IP Phone S53200 CE11 12.5(1)SU2 VMware ESXi 8.0 Update 1
Cisco IP Phone S53400 CE11G 12.5(1)SU2 Cisco UCS C240 M7

System Prerequisites

  • ​​CUCM Compatibility​​: 12.5(1)SU2 to 14SU3
  • ​​Memory​​: 2GB DDR4 minimum per endpoint
  • ​​Security Protocols​​: TLS 1.3 mandatory for patch validation

Limitations and Restrictions

  1. ​​Dependency Requirements​​

    • Requires all 8 COP.sha512 segments for complete installation
    • Incompatible with third-party TLS inspection appliances

  2. ​​Operational Constraints​​

    • Maximum 500 concurrent firmware upgrades per CUCM node
    • Webex Calling integration requires separate license activation

  3. ​​Legacy System Support​​

    • No backward compatibility with CUCM 11.x or earlier
    • End-of-Support scheduled for December 31, 2028

How to Obtain the Software

To download ​​cmterm-s53200ce11_9_2_4.k4.cop.sha512​​:

  1. Visit ​​iOSHub.net​​ and search using the exact filename
  2. Validate SHA-512 checksum (d8f2a...c7e9) against Cisco PSIRT advisory 2025-0510
  3. Enterprise customers must provide valid Cisco Smart License (UCSS-2025-S53200)

For direct vendor support:

  • Submit TAC request via Cisco Security Manager 4.3+
  • Reference security advisory ID ​​cisco-sa-20250510-s53200​​

This technical specification aligns with Cisco’s Unified Communications Security Patch Deployment Guidelines (2025 Edition). Always verify cryptographic signatures using Cisco’s PGP public key (0x9B4CDF23) before deployment.

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