NetBackup Appliance 5.3.0.1 Maintenance Release 2 can now be downloaded from the following link:
https://www.veritas.com/support/en_US/downloads/update.UPD374317
NetBackup Appliance 5.3.x uses Red Hat Enterprise Linux (RHEL) 8.8.
To continue receiving important Operating System vulnerabilities fixes, it is critical that customers on pre-5.3.x releases upgrade to MR2 as soon as possible, since the Red Hat versions used by pre-5.3.x releases are no longer supported by Red Hat.
https://www.veritas.com/support/en_US/article.100062456
