https://www.bleepingcomputer.com/news/security/cisco-warns-of-actively-exploited-bug-in-carrier-grade-routers/

Cisco warned over the weekend that threat actors are trying to exploit a high severity memory exhaustion denial-of-service (DoS) vulnerability in the company's Cisco IOS XR software that runs on carrier-grade routers.

Cisco's IOS XR Network OS is deployed on multiple router platforms including NCS 540 & 560, NCS 5500, 8000, and ASR 9000 series routers.