United States
USA
Nucor cyber incident halts production at multiple facilities
Nucor detected unauthorized third-party access to its IT systems on 13 May 2025 and proactively took affected systems offline. The incident temporarily limited access to applications supporting operations and caused Nucor to halt certain production operations at multiple locations. A later SEC filing confirmed limited data exfiltration and restoration of the affected production operations and IT applications; Nucor stated that the incident did not have a material impact on its overall business operations or financial condition.
80
Estimated severity
80 / 100
99
Source reliability
99 / 100
Approximate Date
13/05/2025
Targeted Company
NUCOR
Targeted Company Supply Chain Impact
Distribution & Fulfillment
Procurement & Sourcing
Production & Manufacturing
Sales (Retail & Ecommerce)
Warehousing
Service Delivery
Unrecognized Impact
Supply Chain Relations
No information
Geographic Impact
Country Targeted Company
Other Affected Countries
No other affected countries reported
Target country
United States
Affected countries
No information
Impacted regions
No information
Operational Impact
Duration
No information
Financial impact (USD M)
No information
Impact types
Production interruptionERP or business system disruption
Affected sectors
Manufacturing
Affected departments
Information TechnologyProduction & Manufacturing
Attack Profile
Attack types
Unauthorized accessData exfiltration
Attributed threat actors
No information
Sources
Incident Sources