Threat definition library?

~ as far as I know: 

Norton pages are lacking since Symantec - Norton parted ways. 

https://www.broadcom.com/support/security-center/attacksignatures

https://www.broadcom.com/support/security-center/a-z

https://www.broadcom.com/support/security-center/definitions/download/detail?gid=n95

Norton has been around for years providing cyber protection for devices like computers, smartphones and tablets. The subscriber base of Norton is worldwide. LifeLock has also been around for years providing identity theft protection in United States.

In the year 2017, Symantec (a parent company of Norton at that time) completed the acquisition of the LifeLock company.

In the year 2019, Symantec went apart from Norton to join Broadcom Inc.
At the same time,  Norton and LifeLock became one company: NortonLifeLock Inc.

My understanding: 
Symantec threat write-up pages hosted on symantec.com domain from the past were removed after the Broadcom's acquisition of Symantec enterprise business. There is no alternative content, at this time.
Since there are no threat write-up pages anymore, all the threat info pages have been redirected to the generic Security Center Emerging Threats page.