While the number matches a known Cisco software bug, .rar files with generic numeric names (like 21398.rar) are frequently used on third-party file-sharing sites to distribute potentially harmful content or cracked software.
Release Notes for StarOSâ„¢ Software Version 21.23.5 - Cisco 21398.rar
: It affected the Control and User Plane Separation (CUPS) architecture within the StarOS operating system used on Cisco ASR 5000 series routers. While the number matches a known Cisco software bug,
: A fix for this task restart issue was included in StarOS Software Version 21.23.5 , released in July 2021. Safety and File Verification Safety and File Verification : Technical patches for
: Technical patches for hardware like the ASR 5000 should only be obtained directly from the Cisco Software Download portal to ensure authenticity.
This identifier refers to a specific technical issue tracked by Cisco:
: The bug involved a task restart (crash) occurring when a configuration was applied to the User Plane (UP) #01.