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The cyber-attack started in December 2020, when a critical vulnerability was identified in the 20-year-old large file transfer service that reached end-of-life on April 30, 2021.
Roughly 50 customers were still using FTA when the security incident took place, but only some of them experienced significant data loss, Accellion claimed.
In February 2021, the major U.S.-based law firm Jones Day confirmed that it was impacted by the attack, after the cyber-criminals behind the Clop ransomware published on their Tor-based leaks website documents allegedly stolen from the company.