According to the Epstein files, he had a "personal hacker" working for him. The FBI document says Epstein's personal hacker was an "Italian citizen born in Calabria who developed zero-day exploits and offensive cyber tools and sold the tools to governments."
https://www.justice.gov/epstein/files/DataSet%2010/EFTA01683874.pdf
"[Redacted] sold a zero-day to Hebollah. [Redacted] was known as the first person to hack and find vulnerabilities in Blackberries and iOS. He was known for finding Firefox vulnerabilities. [Redacted] former company was acquired by CrowdStrike in fall of 2017 and was currently a vice president there."
"S//NF= was very good at finding vulnerabilities was friends with "old school" European hackers. "Received a trunk of cash from Hezbollah when was in Italy; drove the money to Switzerland and deposited it in another ba [redacted]. [redacted] owned a theater company in California and he used the theater company to launder his zeroday money
"Made six figures from the sale of his zero-days. He sold his tools to United Kingdom GCHQ and provided training to the organization. He also sold his zero-days to a Central African government, as well as Hezbollah for political reasons. The Italian Government asked for help, but [redacted] declined because he felt the Government was incompetent. Calabria was mob-controlled an did not have much loyalty for his birth country.
"[Redacted] sold his exploits to the United States and United Kingdom, but he would not sell to Asian countries because he a is racist. He was also anti-Semitic. [Redacted] was terrified of Russia, however, and would never travel there. He lived in Dubai at one time, and was acquainted with the [redacted] lived in Oman as well. He may have an Iranian and Israeli passport, in addition to his Vatican City passport"
Looks likely the top commenter here is correct about "Epstein's hacker":
