SAC121 was published on 9 June 2022. All SSAC publications can be found at

Recommendation DescriptionCurrent Phase
Recommendation 1The routing system today is subject to a continuous stream of routing anomalies that affect its integrity and that sometimes cause large DNS outages. For example, in April of 2018 attackers were able to “hijack” routes to Amazon’s Route53 DNS services, which resulted in DNS traffic for domains hosted on this service ending up at a different destination network where it was served by malicious DNS servers.

In this report, the SSAC discusses events like these and what impact similar incidents can have on the DNS, surveys the pros and cons of various solutions, and discusses future security extensions of the routing system (e.g., path validation). The main focus of this report is on the security and stability implications for the DNS, although most of it also applies to other types of Internet applications (e.g., email, web, media streaming).