AVEVA PI Server versions 2023 and 2018 SP3 P05 and prior contain a vulnerability that could allow an unauthenticated user to cause the PI Message Subsystem of a PI Server to consume available memory resulting in throttled processing of new PI Data Archive events and a partial denial-of-service condition.
https://www.cisa.gov/news-events/ics-advisories/icsa-24-130-01
https://www.cisa.gov/news-events/ics-advisories/icsa-24-018-01