Nucor cyberattack halts some production, data stolen
In May 2025, US steelmaker Nucor took some networks offline and temporarily halted production at several sites in response to a cyberattack. 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.
Key facts
- Affected organization
- Nucor
- Incident type
- Data breach
- Occurred / detected
- Not confirmed
- Scale of damage
- Temporary production halt at several sites and limited data leak
- Cause / method
- System breach and data theft in a cyberattack
- Location
- United States
If your data was exposed
- Don’t tap links in texts, calls or emails that mention this incident and offer compensation, refunds or breach checks. Check directly on the organization’s official website or app.
Timeline
- Nucor disclosed that it had taken some networks offline and temporarily halted production at several sites in response to a cyberattack.
- Nucor confirmed that operations had been restored and that a limited amount of data had been leaked.
- It was reported that a class action over the Nucor data leak was being considered.
7 related reports
- Steelmaker Nucor halts some production after cyber security incident
- Steelmaker Nucor Shuts Down Some Output After Cyberattack
- Steel giant Nucor Corporation facing disruptions after cyberattack
- Production at Steelmaker Nucor Disrupted by Cyberattack
- Steelmaker Nucor restores operations, confirms limited data breach
- Steelmaker Nucor Says Hackers Stole Data in Recent Attack
- Nucor Corporation Data Breach Lawsuit Investigation
Other incidents at Nucor
US steelmaker Nucor's May cyberattack led to data leak
US steelmaker Nucor was hit by a cyberattack in May 2025. In June, the company confirmed that data had been stolen in the attack.
Related reports: 3 · last report →
The summary and key facts are written by AI from related reports and may contain errors. Check the original articles and the organization’s official statements for accurate details.