2020 United States federal government data breach.

The 2020 United States federal government data breach was a cyberattack on the United States that was most likely initiated by the government of the Russian Federation. The data breach lasted for months during 2020 and affected numerous government agencies. The effects of the breach were not known at the time, and experts suggested that the United States might never know the full extent of the hack. The hackers used a popular network software to infiltrate and take information from networks used by the US government and private businesses, mostly inside the United States.