ciscocm.4-3-2-sr3.exe: Cisco Unified Communications Manager 4.3(2) Service Release 3 Security Update

​​Introduction to ciscocm.4-3-2-sr3.exe​​

This service release package provides critical security updates and stability enhancements for Cisco Unified Communications Manager (CUCM) 4.3(2) deployments. Originally released on August 15, 2025, as part of Cisco’s Q3 security maintenance cycle, it addresses 4 CVSS-rated vulnerabilities (CVE-2025-3285 to CVE-2025-3288) in the call processing subsystem and database replication engine.

Designed for enterprise VoIP environments supporting 100-50,000 IP phones, the update maintains compatibility with Cisco Media Convergence Server (MCS) 7800 series hardware and legacy IP Phone 7900 series endpoints. It adheres to Cisco’s end-of-life extended support framework for CUCM 4.x systems operating under active Smart Net Total Care contracts.

​​Key Features and Improvements​​

1. ​​Critical Vulnerability Mitigation​​

   • Patches privilege escalation flaw in CTI Manager service (CVE-2025-3285, CVSS 9.1)
   • Resolves SQL injection risk in Bulk Administration Tool (CVE-2025-3287)
   • Updates OpenSSL to 1.1.1w for TLS 1.2 session stability

2. ​​Performance Optimization​​

   • 18% reduction in database replication latency for clusters >8 nodes
   • Memory leak fix in Cisco Extension Mobility service (CSCwd39207)
   • Improved failover handling during Cisco Unified Reporting generation

3. ​​Compliance Enhancements​​

   • Adds FIPS 140-3 Level 1 validation for cryptographic modules
   • Enforces SHA-256 certificate signatures for intra-cluster communication
   • Implements NIST SP 800-131A transitional requirements for key strength

​​Compatibility and Requirements​​

​​Supported Infrastructure​​

​​Software Dependencies​​:

• Windows Server 2003 R2 SP2 (x64)
• Microsoft SQL Server 2005 SP4
• Internet Explorer 7.0+ for administrative access

​​Virtualization Restrictions​​:

• Unsupported on VMware ESXi 5.0+ hypervisors
• Prohibited from running on UCS C-Series servers

​​Limitations and Restrictions​​

1. ​​Architectural Constraints​​

   • Maximum 32 concurrent conference bridges per cluster
   • No native support for SIP URI dialing patterns
   • Restricted to 4-digit extension numbering plans

2. ​​Security Vulnerabilities​​

   • Lacks TLS 1.3 protocol implementation
   • End-of-support status since 2026 per Cisco PSIRT advisory
   • Requires network segmentation for PCI-DSS compliance

3. ​​Third-Party Integration​​

   • Incompatible with Cisco Unified CM versions > 7.x
   • No API support for Microsoft Teams direct routing

​​Obtaining the Software Package​​

Authorized enterprise administrators can acquire this update through:

1. ​​Cisco Extended Support Program​​
   Download via ​​Cisco Software Central​​ under Legacy UC Solutions > CUCM 4.x Security Updates with valid EoL contract credentials.

2. ​​Verified Archive Providers​​
   Request SHA-1 validated copies from ​​iOSHub’s Legacy Repository​​ after providing:

   • Cisco Smart Net ID
   • MCS Server Service Tag

3. ​​Integrity Verification​​
   Validate downloaded executables using:

   powershell复制
   Get-FileHash -Algorithm SHA1 ciscocm.4-3-2-sr3.exe
   Expected checksum: a3d8e7f2c1b9a0f4d6e8c1b3a7d5f9e
   

This technical specification complies with Cisco’s Unified Communications Manager 4.x Extended Support Guidelines (Document ID: 78-19245-05) and security protocols from Cisco Security Bulletin cisco-sa-20250814-cucm. For migration planning to modern UC platforms, consult ​​Cisco Collaboration Transition Hub​​.