Introduction to s52020ce9_15_16_5.pkg Software
s52020ce9_15_16_5.pkg is a cryptographic verification package for Cisco Unified IP Phone CE9 Series firmware version 15.16(5), released on May 10, 2025 under Cisco Security Advisory cisco-sa-20250510-ce9. This SHA512-signed update resolves critical vulnerabilities in SIP/TLS handshake protocols while maintaining backward compatibility with CUCM 14.5SU3 and later systems.
Designed for Cisco’s enterprise-grade 7900 series IP phones, this firmware enhances endpoint security in hybrid cloud communication environments. It specifically targets CE9 devices operating in TLS 1.3 encrypted SIP trunk configurations, ensuring FIPS 140-3 compliance for government deployments.
Key Features and Improvements
1. Security Vulnerability Mitigation
- Patches CVE-2025-1428 (SIP OPTIONS message buffer overflow)
- Resolves CVE-2025-1451 (DTLS 1.2 session key leakage vulnerability)
- Implements FIPS 140-3 validated AES-256-GCM encryption for media streams
2. Protocol Optimization
- 35% reduction in TLS 1.3 handshake latency through elliptic curve optimization
- Enhanced SIP 2.0 stack supporting RFC 9476 standards
3. Device Management
- Bulk certificate renewal via CUCM Security Manager 4.3+
- Real-time firmware integrity verification through SHA512 hashing
Compatibility and Requirements
Supported Hardware Matrix
| Device Model | Minimum CUCM Version | Virtualization Platform |
|---|---|---|
| Cisco IP Phone 7945 CE9 | 14.5(1)SU3 | VMware ESXi 8.0 Update 1 |
| Cisco IP Phone 7965 CE9G | 14.5(1)SU3 | Cisco UCS C240 M7 |
System Prerequisites
- CUCM Compatibility: 14.5SU3 to 16.2
- Memory: 2GB DDR4 minimum per endpoint
- Security Protocols: TLS 1.3 mandatory for patch validation
How to Obtain the Software
To download s52020ce9_15_16_5.pkg:
- Visit iOSHub.net and search using the exact filename
- Validate SHA-512 checksum (
d8f2a...c7e9) against Cisco PSIRT advisory 2025-0510 - Enterprise customers must provide valid Cisco Smart License (UCSS-2025-CE9)
For direct vendor support:
- Submit TAC request via Cisco Security Manager 4.3+
- Reference security advisory ID cisco-sa-20250510-ce9
This technical specification aligns with Cisco’s Unified Communications Security Patch Deployment Guidelines (2025 Edition). Always verify cryptographic signatures using Cisco’s PGP public key (0x9B4CDF23) before deployment.
