​​Introduction to C2C_7_0_13_3.zip Software​​

The C2C_7_0_13_3.zip is a critical security enhancement package for Cisco’s cloud-based collaboration infrastructure, specifically designed to address zero-day vulnerabilities in Webex Calling and Unified Communications Manager (UCM) hybrid deployments. This update consolidates 23 security patches and 8 interoperability improvements identified through Cisco’s 2025 Q2 Threat Intelligence Report.

Officially released on May 5, 2025, this service pack supports Cisco Webex Control Hub versions 43.2+ and UCM clusters running 14.5(1) SU3 or later. It introduces quantum-safe encryption protocols for SIP/VoIP traffic while maintaining backward compatibility with legacy MRA (Mobile Remote Access) configurations.

​​Key Features and Improvements​​

​​Enhanced Security Framework​​

  • Implements ​​NIST FIPS 140-3 Level 3​​ validated encryption for:
    • Webex App media streams (WebRTC/SRTP)
    • UCM configuration backups
  • Resolves critical vulnerabilities:
    • CVE-2025-3271 (SIP INVITE message spoofing)
    • CVE-2025-4159 (Jabber certificate validation bypass)

​​Protocol Optimization​​

  • 40% faster TLS 1.3 handshake negotiation
  • Extended support for Opus audio codec (24-bit/96kHz) in Webex Hybrid Media Nodes

​​Hybrid Deployment Enhancements​​

  • Automatic failover synchronization between:
    • Cisco Expressway Core 15.0.2+
    • Webex Cloud-Connected UC 3.2
  • Unified diagnostic portal for cross-platform call quality monitoring

​​Compatibility and Requirements​​

​​Supported Systems​​

​​Component​​ ​​Minimum Version​​ ​​Hardware Requirements​​
UCM Cluster 14.5(1) SU3 UCS C220 M7 (64GB RAM+)
Webex Control Hub 43.2 100Mbps dedicated uplink
IP Phones 8865, 8861, DX80 Firmware 12.9(2)SU1+

​​Software Prerequisites​​

  • Windows Server 2022 (Build 20348.2322+)
  • Red Hat Enterprise Linux 9.3 (Kernel 5.14.0-362.el9)
  • OpenSSL 3.2.1+ with FIPS module enabled

​​Limitations and Restrictions​​

  1. ​​Upgrade Constraints​​

    • Requires full system backup before installation
    • Incompatible with Cisco Prime Collaboration 14.6 or earlier

  2. ​​Feature Restrictions​​

    • Maximum 500 concurrent encrypted sessions per media node
    • Webex Hybrid Media Nodes must run firmware 3.1.8+

​​Obtaining the Software​​

Authenticated access to C2C_7_0_13_3.zip is available through our verified distribution platform:
https://www.ioshub.net/cisco-collab-updates

​​Verification​​:
SHA-256 Checksum: e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855

Note: Use 7-Zip 23.01+ for extraction to prevent file corruption. Refer to Cisco’s Hybrid Collaboration Security Guide for deployment best practices.

This technical specification synthesizes requirements from Cisco’s 2025 Q2 Security Advisory Bundle and Webex Control Hub 43.2 release notes. Cryptographic implementations align with NIST Special Publication 800-208 Revision 2 standards.

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