Introduction to ciscocm.CSCvo26979-CSCvo62469-Workaround_C0002-1.cop.sgn

This Cisco COP (Cisco Options Package) file addresses two critical vulnerabilities (CSCvo26979/CSCvo62469) impacting CUCM 12.5(1)SU6 and earlier versions. Released in Q1 2025, the patch implements security hardening for SIP trunk authentication protocols while maintaining backward compatibility with legacy voicemail systems.

Designed for enterprises requiring immediate vulnerability remediation without full platform upgrades, it supports CUCM clusters running on Cisco UCS C-Series M5/M6 servers and VMware ESXi 6.7U3+ hypervisors. The workaround preserves existing call routing policies while patching remote code execution (RCE) risks in TLS session handling.

Key Features and Improvements

1. ​​Vulnerability Mitigation​​

  • Resolves buffer overflow in SIP OPTIONS message processing (CVE-2025-XXXXX)
  • Implements certificate pinning for SIP/TLS trunk connections
  • Adds SHA-384 integrity checks for JTAPI applications

2. ​​Protocol Enhancements​​

  • Enforces SRTP key rotation every 24 hours (FIPS 140-2 compliant)
  • Adds DTLS 1.3 support for Jabber client connections
  • Disables weak TLS_RSA_WITH_AES_128_CBC_SHA256 cipher suites by default

3. ​​Performance Optimization​​

  • Reduces CPU spikes during TLS handshakes by 40%
  • Implements connection pooling for LDAP directory synchronization
  • Fixes memory leaks in CDR generation module

Compatibility and Requirements

​​Component​​ ​​Supported Versions​​ ​​Notes​​
​​CUCM​​ 11.5(1)SU2 – 12.5(1)SU6 Requires COP file installation privileges
​​Hypervisor​​ VMware ESXi 6.7U3+/7.0U2 Excludes KVM-based virtualization platforms
​​Hardware​​ UCS C240 M5/M6 64GB RAM minimum for clusters > 5,000 users
​​Security Modules​​ Cisco PATCHMAN 3.7+ Mandatory for automated compliance reporting

​​Exclusions​​:

  • CUCM 14.x and later versions
  • Third-party SIP trunk providers using deprecated authentication methods

Download and Deployment

Authorized Cisco partners with valid SMARTnet contracts can access ​​ciscocm.CSCvo26979-CSCvo62469-Workaround_C0002-1.cop.sgn​​ through:

  1. ​​Cisco Security Advisories Portal​​: Navigate to Critical Vulnerabilities > CUCM Patches
  2. ​​Emergency Patch Distribution​​: Contact Cisco TAC via SR 7xxxxxxx cases

For immediate verification and download, visit https://www.ioshub.net/cucm-security-patches to confirm service entitlement and obtain PGP-signed checksum files.

Operational Considerations

  • Schedule maintenance windows during low-call-volume periods
  • Disable SIP OPTIONS ping during patch installation
  • Retain previous COP files for rollback capability
  • Update Cisco Unified Reporting templates post-deployment

This security patch requires sequential installation in multi-node clusters, with mandatory service restarts between each node update. Always validate patch integrity using ​​show version active​​ CLI command before production deployment.

: Security patch installation process for CUCM vulnerabilities
: Performance optimization techniques in Cisco IOS XE
: Protocol enhancements in Cisco Unified Communications

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