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.
Key facts
- Affected organization
- Nucor
- Incident type
- Data breach
- Occurred / detected
- Not confirmed
- Scale of damage
- Not confirmed
- Cause / method
- 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
- It was reported that Nucor had been hit by a cyberattack.
- Nucor confirmed a data leak resulting from the May attack.
3 related reports
Other incidents at Nucor
Nucor cyberattack 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 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.
Related reports: 7 · 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.