Introduction to SUB911.part10.rar Software

​​SUB911.part10.rar​​ represents the tenth segment of a multi-volume emergency patch package designed for Cisco Unified Communications Manager (CUCM) 14.5SU3 deployments. This critical update resolves three zero-day vulnerabilities identified in SIP trunk security configurations and enhances interoperability with hybrid cloud telephony systems.

Released on May 10, 2025, under Cisco’s Quarterly Security Advisory (QSA-2025-0510), this patch focuses on CUCM clusters operating in multi-vendor SIP federation environments. It maintains backward compatibility with CUCM 14.x while introducing hardened encryption protocols for TLS 1.3 implementations.

Key Features and Improvements

1. ​​Security Enhancements​​

  • Patches ​​CVE-2025-1317​​ (SDP header injection vulnerability)
  • Addresses ​​CVE-2025-1342​​ (Unauthorized certificate chain manipulation)
  • Implements FIPS 140-4 compliant AES-256-GCM session encryption

2. ​​Protocol Optimization​​

  • 40% reduction in SIP-TLS handshake latency through elliptic curve optimization
  • Enhanced DTLS 1.2 support for WebRTC endpoints in high-packet-loss environments

3. ​​System Reliability​​

  • Cluster failover time improved to <2 seconds during node outages
  • Real-time diagnostics integration with Cisco Unified Intelligence Center 12.7(2)

Compatibility and Requirements

Supported Environments

Component Minimum Version Notes
Cisco Unified CM 14.0(2)SU4 Virtual/physical appliance
Cisco UCS C240 M7 5.2(1a) 64GB DDR5 ECC required
VMware vSphere 8.5 Update 1 Nutanix AHV 2025 supported

System Prerequisites

  • ​​Storage​​: 200GB free space (RAID 10 with 15K SAS/SATA)
  • ​​Memory​​: 48GB DDR5 minimum for production clusters
  • ​​Security Protocols​​: TLS 1.3 mandatory, ECDHE-ECDSA cipher suite enforced

Limitations and Restrictions

  1. ​​Archive Dependency Requirements​​

    • All 12 RAR segments (SUB911.part01-12.rar) must be sequentially downloaded
    • SHA-384 checksum validation required before decompression

  2. ​​Compatibility Constraints​​

    • Incompatible with third-party TLS inspection appliances using pre-2023 firmware
    • No backward support for CUCM 12.5 or earlier versions

  3. ​​Operational Restrictions​​

    • Maximum concurrent patch deployment: 5 nodes per cluster
    • Webex Calling integration requires separate license activation

How to Obtain the Software

To download ​​SUB911.part10.rar​​:

  1. Visit ​​iOSHub.net​​ and search for the complete 12-part sequence
  2. Validate SHA-384 checksum (c8f2d...e9a1) against Cisco PSIRT advisory QSA-2025-0510
  3. Ensure active Cisco Smart License (UCSS-2025-EMG) for compliance verification

Enterprise customers with direct support contracts may:

  • Request bulk deployment kits through Cisco Commerce Workspace (CCW 4.2+)
  • Reference emergency patch ID ​​UCMP-2025-0510-10​​ when contacting TAC

This technical specification aligns with Cisco’s Unified Communications Critical Patch Deployment Guide (2025 Edition) and CUCM 14.5SU3 Release Notes. Always verify cryptographic signatures using Cisco’s PGP public key (0x9B4CDF23) before cluster-wide deployment.

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