21398.rar -

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.

: It affected the Control and User Plane Separation (CUPS) architecture within the StarOS operating system used on Cisco ASR 5000 series routers. 21398.rar

Release Notes for StarOS™ Software Version 21.23.5 - Cisco While the number matches a known Cisco software bug,