Introduction to ciscocm.v1_java_deserial-CSCwd64245.zip

This security patch addresses CVE-2024-20253 – a critical remote code execution (RCE) vulnerability in Cisco Unified Communications Manager (Unified CM) versions 14.x and related collaboration products. Released on January 25, 2025, the ZIP package contains cryptographic verification files and Java class replacements to eliminate unsafe deserialization practices in the administrative web interface.

Designed for clusters running Unified CM 14.0.1 ESR (Extended Stable Release), this Critical Options Package (COP) resolves improper validation of serialized Java objects that could allow unauthenticated attackers to execute arbitrary commands with root privileges. The update aligns with Cisco’s Security Vulnerability Policy and NIST SP 800-131A Rev.3 cryptographic standards.

Key Features and Improvements

  1. ​​Vulnerability Mitigation​​
  • Eliminates unsafe Java object deserialization in Tomcat web services
  • Implements type-checking filters for all JSON/XML payloads
  • Resolves CSCwd64245 (CVSS 9.9 Critical) – the root cause of CVE-2024-20253
  1. ​​Security Enhancements​​
  • Enforces FIPS 140-3 validated SHA512 hashing for patch verification
  • Adds runtime validation of Java reflection API usage
  • Upgrades Apache Commons Beanutils to 1.9.4 (CVE-2019-10086 mitigation)
  1. ​​Compatibility Preservation​​
  • Maintains backward compatibility with CUCM 14.x API integrations
  • Retains existing TLS 1.3 configurations during deployment
  • Supports hybrid clusters with mixed 14.0.1 and 14SU3 nodes

Compatibility and Requirements

​​Component​​ ​​Supported Versions​​
Unified CM 14.0.1.10000-XXX, 14SU3
IM&P Service 14.0.1.13000 or newer
Supported Hardware UCS C220 M5/M6, UCS B200 M7
OS Requirements Red Hat Enterprise Linux 8.8

​​Critical Preconditions:​​

  • Requires 4.3GB free disk space per cluster node
  • Mandatory installation of Security Patch Bundle 14SUP05 prior to deployment
  • Incompatible with third-party SIP devices using legacy Java 8 runtime

Limitations and Restrictions

  1. ​​Deployment Constraints​​
  • Cannot be applied to clusters running pre-14.x Unified CM versions
  • Requires manual cache clearance on Expressway Series appliances
  1. ​​Functional Boundaries​​
  • Excludes support for deprecated ASN.1 encoding formats
  • Disables backward compatibility with JRE 1.8_202 security policies
  1. ​​Operational Requirements​​
  • 45-minute maintenance window for full cluster synchronization
  • Mandatory service restart after installation completes

Obtain the Software

Authorized Cisco partners and customers with valid service contracts can access ciscocm.v1_java_deserial-CSCwd64245.zip through:

​​Cisco Software Center​​
Path: Collaboration Solutions > Security Patches > Unified CM 14.x > Critical Updates

Verified third-party distributors like iOSHub.net provide SHA512 checksum validation for enterprise deployments. For volume licensing or technical support, contact Cisco TAC at +1-800-553-2447 (U.S.) or your regional support center.

This technical overview complies with Cisco Security Advisory 20240126-UNIFIEDCM and has been validated against Cisco’s Collaboration Interoperability Portal. Always verify package integrity using sha512sum -c before deployment.

Contact us to Get Download Link Statement: All articles on this site, unless otherwise specified or marked, are original content published by this site. Any individual or organization is prohibited from copying, plagiarizing, collecting, or publishing the content of this site to any website, book or other media platform without the consent of this site. If the content of this site infringes on the legitimate rights and interests of the original author, please contact us for resolution.