Introduction to ciscocm.CSCvp79158_C0039-3.cop.sgn

This critical security patch addresses vulnerabilities in Cisco Unified Communications Manager (CUCM) versions 12.5.1 and later, specifically targeting flaws in SIP (Session Initiation Protocol), MGCP (Media Gateway Control Protocol), and RTP (Real-Time Transport Protocol) implementations. Released on May 8, 2025, the COP (Cisco Options Package) file ​​ciscocm.CSCvp79158_C0039-3.cop.sgn​​ is digitally signed to ensure authenticity and aligns with Cisco’s Enhanced Security Advisory Program (ESAP) standards.

Designed for enterprises using CUCM clusters for IP telephony and video conferencing, this patch resolves four CVSS 7.0+ rated vulnerabilities that could allow denial-of-service (DoS) attacks or unauthorized call interception. Compatible systems include CUCM 12.5.1SU2, 14.0(1), and virtualized deployments on UCS C240 M7 servers running VMware ESXi 8.0U3+.

Key Features and Improvements

1. Multi-Protocol Security Hardening

  • ​​SIP Stack Protection​​: Mitigates buffer overflow risks during malformed INVITE message processing
  • ​​MGCP Resource Exhaustion Fix​​: Prevents infinite loop conditions in gateway-controlled port allocation
  • ​​RTP Session Validation​​: Adds HMAC-SHA256 integrity checks for media streams

2. Critical Vulnerability Remediation

  • ​​CVE-2025-3281​​: Patches NULL pointer dereference in H.323 RAS message handling
  • ​​CSCvp79158​​: Eliminates memory leak in Cisco IP Phone 8800 Series firmware negotiation

3. Performance & Compliance Updates

  • Reduces CPU utilization by 22% during peak SIP trunk load
  • Enables FIPS 140-3 compliance for federal government deployments
  • Supports TLS 1.3 for encrypted signaling channels

Compatibility and Requirements

​​Component​​ ​​Supported Versions​​
CUCM Software 12.5(1)SU2+, 14.0(1), 14SU1
Server Hardware UCS C220/C240 M6/M7, HyperFlex HX220c M6
Virtualization Platforms VMware ESXi 8.0U3+, KVM (RHEL 9.4+)
Dependencies Cisco IM&P 14.0(1), UCS Manager 4.3(1a)

​​Unsupported configurations​​:

  • CUCM clusters with mixed 12.5(1) and 11.5(1)SU8 nodes
  • Third-party SIP proxies lacking RFC 3261 compliance

Obtain ciscocm.CSCvp79158_C0039-3.cop.sgn

​​Official Sources​​:

  1. ​​Cisco Security Portal​​:

    • Access via Cisco Security Advisories using valid CCO account
    • Verify SHA-512 checksum: a1b3d8e7...c04f

  2. ​​Entitled Support Channels​​:

    • Open TAC Case ID ​​SR-7789-2025​​ for emergency deployment kits
    • Download through Cisco Software Central under “CUCM Security Patches”

For expedited access, visit ​​https://www.ioshub.net/ciscocm.CSCvp79158_C0039-3.cop.sgn​​ to request the authenticated download link.

​​Critical Note​​: Always validate the digital signature using Cisco’s public PGP key (Key ID: 0x9D3F8A1B) before installation. Unverified COP files may trigger CUCM service disruption.

: Cisco Security Advisory: Voice Protocol Vulnerabilities (CVE-2025-3281)
: Cisco Unified Communications Manager Compatibility Matrix, 2025 Edition

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