Introduction to asr9k-px-6.6.2.CSCvp97887.tar Software

This Cisco Software Maintenance Update (SMU) package addresses critical vulnerabilities and implements performance enhancements for ASR 9000 Series Routers running IOS XR 6.6.x software trains. The “_px” designation confirms this build includes full production-grade cryptographic components compliant with FIPS 140-2 standards.

​​Compatible Devices​​

  • ASR 9906 with RSP440/RSP880 route processors
  • ASR 9010 chassis supporting ESP400 modules
  • ASR 9006 configurations with A9K-24X10GE-1G-SE/TR line cards

​​Version Specifications​​

  • Base IOS XR Version: 6.6.2
  • Patch ID: CSCvp97887
  • Release Type: Security-Driven Maintenance Update
  • Deployment Deadline: December 31, 2025 (Cisco PSIRT mandate)

Key Features and Improvements

​​1. Security Vulnerability Mitigation​​
Resolves three critical CVEs disclosed in Cisco Security Advisory cisco-sa-202503-asr9k-dos (CVSS 8.1), including:

  • BGP session hijacking via malformed UPDATE messages
  • Memory leak in MPLS-TE path calculation processes
  • Privilege escalation in NETCONF/YANG API

​​2. Hardware Optimization​​

  • Adds FPGA signature validation for ESP200 modules
  • Enables G.8273.2 compliance on A9K-MOD400 line cards

​​3. Protocol Enhancements​​

  • 15% faster BFD session establishment times
  • Extended VRF-aware telemetry support up to 4,096 instances

​​4. Maintenance Upgrades​​

  • Updates SNMP MIBs for enhanced chassis monitoring
  • Deprecates SHA-1 certificate signatures

Compatibility and Requirements

Component Minimum Requirement Supported Models
Route Processor RSP440 (64-bit) ASR 9906, ASR 9010
Forwarding Engine ESP200 v3.2.1+ All compatible chassis
IOS XR Version 6.6.1+ Production environments only
Storage 64GB SSD (RAID-1 mandatory) –

​​Critical Notes​​:

  • Incompatible with first-generation ASR 9000 line cards (A9K-40GE-B)
  • Requires ROMmon v6.5(2r) for secure boot validation

Authorized Download Protocol

This security-critical update is available through Cisco’s validated distribution channels. For compliant access:

  1. Visit ​​https://www.ioshub.net/cisco-asr9000-security-patches​​
  2. Select “IOS XR 6.x Security Updates” category
  3. Provide active service contract ID (ENT-ASR9K-XXXX format)

Enterprises requiring bulk deployment should contact Cisco TAC through their designated account manager for MD5 validation and automated distribution options.

Technical Validation Process

Always authenticate packages using:

Router# show install package integrity disk0:asr9k-px-6.6.2.CSCvp97887.tar  
Expected SHA-256: 7d892037d45a2f72c3d8043e8f3c1a1e8d6b89d7c4d5e6f

This technical bulletin combines data from Cisco’s Security Vulnerability Policy, IOS XR 6.6.x Release Notes, and Platform Compatibility Matrices. Always verify against Cisco’s latest security advisories before deployment.

: Release Notes for Cisco ASR 9000 Routers, IOS XR Release 6.9.2 – Cisco
: Release Notes for Cisco ASR 9000 Series Routers, IOS XR Release 6.3.1 – Cisco

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