The updated advisory is a follow-up to the advisory update titled ICSA-21-266-01 Trane Symbio (Update A) that was published on November 18, 2021, to the ICS webpage on www.cisa.gov/uscert. This advisory contains mitigations for a Code Injection vulnerability in Trane Symbio 700 and Symbio 800 controllers.

https://us-cert.cisa.gov/ics/advisories/icsa-21-266-01