> The Dutch NCSC (NCSC-NL) was informed in December 2021, after which meetings were held with the law enforcement and intelligence communities, as well as with ETSI and the vendors. Shortly afterwards, on 2 February 2022, preliminary advice was distributed to the various stakeholders and CERTs. The remainder of 2022 and the first half of 2023 were used for coordination and advisory sessions with stakeholders, allowing manufacturers to come up with firmware patches, updates or workarounds.
This reads to me as if malicious parties were notified some 18 months before users were notified.
