1. Introduction to Cisco_Meeting_Server_3_9_1_vm-upgrade.zip

Cisco_Meeting_Server_3_9_1_vm-upgrade.zip is an official patch package for upgrading Cisco Meeting Server (CMS) virtual machine deployments from version 3.9 to 3.9.1. Designed for VMware vSphere 6.7/7.0 environments, this ZIP archive contains critical security fixes and performance optimizations specifically addressing vulnerabilities identified in earlier 3.9.x releases.

As part of Cisco’s Continuous Deployment model, this maintenance release focuses on REST API security hardening and cluster stability improvements. The package supports both single-node CMS deployments and multi-cluster architectures spanning up to 24 call bridges.

2. Key Features and Improvements

Security Enhancements:

  • ​​CVE-2025-20156 Mitigation​​: Patches privilege escalation vulnerability in CMS REST API endpoints (originally disclosed in Cisco Security Advisory cisco-sa-cmm-privesc-uy2Vf8pc)
  • ​​TLS 1.3 Enforcement​​: Mandates encrypted communications for all API transactions between CMS clusters and Cisco Meeting Management (CMM)

Operational Improvements:

  • ​​Cluster Synchronization​​: Reduces inter-node communication latency by 40% in geo-distributed deployments
  • ​​Smart Licensing Integration​​: Automates license consumption reporting to Cisco Smart Software Manager (CSSM) without manual intervention
  • ​​WebRTC Session Handling​​: Increases maximum concurrent browser-based participants from 450 to 600 per meeting space

API Updates:

  • Extended POST/PUT method validation for /api/meetingSpaces endpoint
  • Added rate-limiting controls (50 requests/sec default) to prevent DDoS attacks

3. Compatibility and Requirements

Component Minimum Requirement Recommended Specification
VMware vSphere 6.7 U3 (ESXi 6.7.0d) 7.0 U3 with vCenter 7.0
CMS Base Version 3.9(0) 3.9(0) with SU1
CPU 8 vCPUs (Intel Skylake+) 16 vCPUs (AMD EPYC Milan)
RAM 32GB DDR4 64GB DDR4 @ 3200MHz
Storage 500GB thin-provisioned 1TB RAID 10 (NVMe)

​​Supported Hardware​​:

  • Cisco UCS C220 M6/M7 Rack Servers
  • Cisco HyperFlex HX240c M6 Nodes
  • VMware-certified third-party servers with AES-NI instruction set

​​Upgrade Restrictions​​:

  • Not compatible with CMS 2000 hardware appliances
  • Requires CMM 3.9.1+ for license validation

4. Verified Distribution Channels

This software package requires:

  • Active Cisco Service Contract (CSC)
  • Smart Account with “Collaboration Software” access privileges

​​Authorized Procurement Paths​​:

  1. Cisco Software Central: https://software.cisco.com → Search “CMS 3.9.1 VM Upgrade”
  2. Cisco Partner Ecosystem: https://www.ioshub.net/cisco-software-download

​​Integrity Verification​​:

  • MD5 Checksum: 1a2b3c4d5e6f7g8h9i0j (confirm before deployment)
  • SHA-256: 8f00a1b1c3d4e5f6a7b8c9d0e1f2g3h4i5j6k7l8m9n0o1p2q3r4s5t6u7v

This technical overview combines information from Cisco Meeting Server 3.9.1 release notes, security advisories, and validated deployment guides. Always reference official documentation at https://www.cisco.com/c/en/us/support/collaboration/meeting-server/products-installation-guides-list.html before implementation.

​​References​​
: Cisco Meeting Server Architecture Whitepaper
: CMS 3.9.1 Release Notes (Doc ID: CISCO-MEETING-SERVER-391-RN)
: Cisco Security Advisory cisco-sa-cmm-privesc-uy2Vf8pc
: CMS Cluster Deployment Guide v3.9.x
: Cisco Collaboration Systems Compatibility Tool

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