HackingManufacturingManufacturingDelayed DiscoveryIdentity (basic)Government IDMediumContained

NUCOR CORPORATION

bd_f0b0185bf1d1823b · schema v1 · pii pii-v1

Severity

Medium

Discovered

May 13, 2025

Filed

Jun 24, 2025

To disclose

6 weeks

Affected

Not disclosed

Linked

6 filings

Confidence

66%

Full breach record for NUCOR CORPORATION →4 incidents on file

Nucor Corporation notified Vermont AG of a cybersecurity incident where an unauthorized third party accessed and acquired personal information (including SSNs) from May 3-13, 2025. Nucor engaged forensic specialists, reported to law enforcement, implemented safeguards, and offered 2 years of Equifax credit monitoring.

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Vermont clock⏱ VT AG >14 bday6 weeks discovery → filing

⚠ unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Incident timeline

undetected · 10 days

discovery → filing · 6 weeks / 42 days

May 3, 2025

Begins

May 13, 2025

Discovered

Jun 24, 2025

Filed

This filing is one of 6 filings about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (5) · sorted by filing gap

Indiana State AGbd_e8dd270c8f1b4b652025-06-24Verified
Massachusetts State AGbd_602a58f53ef5e6fe2025-06-27 · +3dVerified
New Hampshire State AGbd_9461555a0a074d8a2025-06-27 · +3dVerified
SEC 8-Kbd_5d4a1347ab3beb1c2025-06-20 · +4dVerified

Show 1 more filing ↓up to 6d gap

New Hampshire State AGbd_70306daf12f7c0d82025-06-30 · +6dVerified

Name: NUCOR CORPORATION
norm: nucor
Domain: nucor.com

Name: NUCOR CORPORATION
norm: nucor
Domain: nucor.com
Industry: Manufacturingllm

Discovered: May 13, 2025
Breach occurred: May 3, 2025 – May 13, 2025
Undetected for: 10 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jun 24, 2025
Affected individuals: Not disclosed
Data types: Identity (basic)Government ID
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing ApplicationT1078 Valid Accounts
Threat actor: External
Regulator citations: reported the matter to law enforcement
Initial access: exploit_public_facing

During the incident: Worked with third-party cybersecurity specialists to ensure the security of our environment and to investigate the unauthorized activity
Reported the matter to law enforcement
Implemented additional technical safeguards to further secure our systems
Offering a two (2) year subscription to Equifax’s Complete TM Premier service at no cost
Changes made: Implemented additional technical safeguards to further secure our systems
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 6 weeks(42 days from discovery to filing)
Compliance flags: VT AG >14 bday
Discovery-date grounding: unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 6 filings · 4 states

View merged incident ↗

SEC 8-KJun 20 · first

Indiana State AG+4d

Vermont State AG+4d · this page

Massachusetts State AG+7d

New Hampshire State AG+7d

New Hampshire State AG+10d

Pattern: first filing Jun 20, last Jun 30 (NH) — a 10-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://ago.vermont.gov/document/2025-06-24-nucor-corporation-data-breach-notice-consumers
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jun 24, 2025
Raw hash: bc4100a628f346ad8ac91a4f1c7851414d993772c0e9d4b4f8562d3ee4de5f48

Linked disclosures

Regulatory filings (5) · sorted by filing gap

Reporting entityNUCOR CORPORATION

Victim entityNUCOR CORPORATION

Incidentdiscovered May 13, 2025

Stated responseWorked with third-party cybersecurity specialists to ensure the security of our environment and to investigate the unauthorized activity

ComplianceVT AG >14 bday

Extraction provenanceno artifact recorded

Source provenanceago.vermont.gov