Nucor security incident history
Hacking, data breaches and other security incidents involving Nucor, with related coverage.
Incidents: 2 · Most recent
US steelmaker Nucor's May cyber-attack led to data leak
US steelmaker Nucor was hit by a cyber-attack in May 2025. In June, the company confirmed that data had been stolen in the attack.
Related reports: 3 · last report →Nucor cyber-attack halts some production, data stolen
Impact: Temporary production halt at several sites and limited data leak
In May 2025, US steelmaker Nucor took some networks offline and temporarily halted production at several sites in response to a cyber-attack. The company disclosed the incident and recovery work in a filing with the US Securities and Exchange Commission. In June, it restored operations and confirmed a limited data leak.
Related reports: 7 · last report →