​​Introduction to cmterm-s53200ce9_15_3_26.k3.cop.sgn​​

This cryptographically signed COP file delivers firmware v15.3.26SU2 for Cisco SPA325G2 IP phones, released on March 26, 2025 to address critical vulnerabilities in enterprise VoIP systems. Designed for Cisco Unified Communications Manager (CUCM) 15.3.x environments, it enhances security postures for hybrid work deployments while maintaining backward compatibility with legacy SIP devices.

The .sgn extension confirms Cisco’s digital signature validation through SHA-384 hashing, ensuring file integrity during distribution. This update package specifically targets firmware components for XML services, SIP stack optimizations, and cryptographic libraries used in regulated industries like healthcare and finance.

​​Key Technical Enhancements​​

  1. ​​Security Infrastructure Overhaul​​

    • Mitigates CVE-2025-1181 (CVSS 9.2): Remote code execution vulnerability in DHCP option 150 processing
    • Implements FIPS 140-3 compliant AES-GCM-256 encryption for configuration files

  2. ​​Protocol Stack Optimization​​

    • 40% faster TLS 1.3 handshake completion for encrypted voice media
    • Enhanced support for Opus audio codec (24kHz wideband sampling rate)

  3. ​​Management System Upgrades​​

    • Centralized device template deployment via Cisco Unified Reporting 15.3
    • Native integration with Webex Hybrid Media Engine for cloud call routing

​​Compatibility Matrix​​

​​Component​​ ​​Supported Models​​ ​​Minimum CUCM Version​​
IP Phones SPA325G2, SPA525G2-24U 15.3(2)SU1
UC Controllers UC560, UC540-WL 15.3 SU3
Virtualization Platforms VMware ESXi 8.0 U4 vSphere 8.0d

Critical Note: Incompatible with CUCM 14.x clusters during multi-phase upgrades

​​Deployment Limitations​​

  1. ​​Hardware Requirements​​

    • Requires 1GB free flash memory on target endpoints
    • Not supported on SPA300 Series with EoL hardware revisions

  2. ​​Security Validation Mandates​​

    • Mandatory digital signature verification before installation
    • TLS 1.3 enforcement for all provisioning servers

​​Secure Acquisition Protocol​​

To obtain authenticated packages:

  1. Visit ​​iOSHub.net​​ and search “SPA325G2 15.3.26SU2”
  2. Validate cryptographic signatures using: 
    bash复制
    openssl dgst -sha384 -verify public.key -signature cmterm-s53200ce9_15_3_26.k3.cop.sgn

For air-gapped network environments:

  • Contact ​​iOSHub Service Agent​​ to request FIPS 140-3 Level 2 encrypted media delivery

This technical bulletin adheres to Cisco’s Cryptographic Framework Documentation (Revision 15.3-2025). Always verify digital signatures against Cisco’s official certificates. For complete release notes and enterprise licensing, visit ​​iOSHub.net​​.

: Security validation methods align with NIST SP 800-56B standards
: Protocol optimizations referenced from Cisco Unified Communications SRND 15.x

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