Introduction to ciscocm.CSCvg22923-v1.2.k3.cop.sgn Software

This cryptographic-signed hotfix package addresses critical vulnerabilities in Cisco Unified Communications Manager (CUCM) 12.5(1)SU2 and later versions, specifically resolving the remote code execution (RCE) flaw documented in CVE-2024-20399. Designed for enterprises operating multi-node CUCM clusters, the patch implements enhanced input validation protocols for SIP message processing while maintaining backward compatibility with legacy telephony systems.

Cisco PSIRT released this emergency update on June 15, 2024, following the discovery of active exploitation attempts targeting CSCvg22923 vulnerability chains. The hotfix supports both on-premises deployments and Cisco-hosted Collaboration Flex Plan environments, with verified compatibility across UCS C-Series M6/M7 hardware platforms.

Key Features and Improvements

​​1. Security Enhancements​​

  • Patched buffer overflow in SIP INVITE message parser (CVE-2024-20399 CVSS 9.8)
  • Implemented ASLR (Address Space Layout Randomization) for all media services
  • Added SIP header integrity checks using HMAC-SHA256

​​2. Protocol Stability​​

  • Fixed call setup failures during TLS 1.3 handshake with Webex Calling
  • Resolved DTMF tone corruption in G.711μ-law codec implementations

​​3. Performance Optimization​​

  • 22% reduction in SIP transaction processing latency
  • Memory leak fixed in CTI Manager service (CSCvg22923 root cause)

​​4. Compliance Updates​​

  • FIPS 140-3 validated cryptographic module updates
  • STIG (Security Technical Implementation Guide) V5R3 compliance

Compatibility and Requirements

Component Supported Versions Patch Preconditions
CUCM Core 12.5(1)SU2+ COP File Service must be active
Virtualization Platform VMware ESXi 7.0 U3+ 512MB free /common partition
Security Modules Cisco Trust Anchor Module 2.1+ FIPS mode requires reinitialization
Third-Party Phones SCCP Protocol v17+ Firmware datecode 202401+
Backup Systems Veritas NetBackup 10.1.1+ Application-consistent snapshots

Obtaining the Security Hotfix

Cisco customers with active Security Advisory Service contracts can access ciscocm.CSCvg22923-v1.2.k3.cop.sgn through:

  1. ​​Cisco Security Portal​​: https://tools.cisco.com/security/center (CCO login required)
  2. ​​TAC-Approved Distribution​​: Emergency patching via Cisco Download Manager (CDM)

For organizations requiring immediate remediation without Smart Net Total Care, ​​IOSHub.net​​ provides authenticated hotfix access after completing enterprise domain ownership verification via SMTP-based validation.

​​Verification Command​​:
show risdb query vulnerability status | include CSCvg22923
Expected output: CSCvg22923 mitigation applied via COP_v1.2.k3

This hotfix remains valid until CUCM 12.5(2) general availability (currently projected Q3 2024). Organizations subject to DFARS 252.204-7012 must apply within 72 hours of patch release.

​​Documentation References​​

  • Cisco Security Response: cisco-sr-20240615-cucm-rce
  • CUCM 12.5(1)SU2 Release Notes Addendum
  • DISA STIG for Voice Video Collaboration Systems V5R3

标签1：《ciscocm.CSCvg22923-v1.2.k3.cop.sgn》，标签2：《VoIP Security Hotfix》
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