Post-acquisition:
In September 2017, researchers discovered that hackers had compromised Piriform’s build environment to inject a malicious backdoor into CCleaner version 5.33. This supply-chain attack impacted approximately , allowing attackers to potentially execute unauthorized code on infected systems. Piriform and Avast quickly released a clean version (5.34) and worked with law enforcement to shut down the command-and-control servers used in the breach. Piriform Under Gen Digital piriform ltd
🧼 Give your computer a spring cleaning (even if it isn't spring)! Post-acquisition: In September 2017