HackingManufacturingManufacturingStolen CredentialsVulnerability ExploitSupply Chain (3P Vendor)Customer Data InvolvedData ExfiltratedIdentity (basic)Financial accountLowContained

NUCOR CORPORATION

bd_f92fdb8fcfe3ebf1 · schema v1 · pii pii-v1

Severity

Low

Discovered

Jun 1, 2023

Filed

Jun 30, 2023

To disclose

29 days

Affected

Not disclosed

Linked

7 filings

Confidence

66%

Full breach record for NUCOR CORPORATION →4 incidents on file

Nucor Corporation disclosed a data breach affecting customers' names, bank account numbers, routing numbers, and deposit amounts. The incident stemmed from a vulnerability in a third-party file transfer software vendor. Unauthorized access occurred between May 26 and June 1, 2023. Nucor disabled access, applied a vendor fix, engaged external cybersecurity investigators, and offered two years of Equifax credit monitoring to affected individuals.

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Vermont clock⏱ VT AG >14 bday29 days 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 · 6 days

discovery → filing · 29 days

May 26, 2023

Begins

Jun 1, 2023

Discovered

Jun 30, 2023

Filed

This filing is one of 7 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (6) · sorted by filing gap

Massachusetts State AGbd_3aca0330760bae952023-06-30Verified
Indiana State AGbd_9aeca2689eec0ada2023-06-30Verified
Maine State AGbd_6a06b9eb150003e92023-07-03 · +3dVerified
New Hampshire State AGbd_b6fb6e4436443cf82023-07-03 · +3dVerified

Show 2 more filings ↓up to 180d gap

South Carolina State AGbd_e41f2b66830eb9a22023-07-03 · +3dVerified
Illinois State AGbd_424a1f9fd75075542023-01-01 · +180dCandidate

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

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

Discovered: Jun 1, 2023
Breach occurred: May 26, 2023 – Jun 1, 2023
Undetected for: 6 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jun 30, 2023
Affected individuals: Not disclosed
Data types: Identity (basic)Financial account
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1195 Supply Chain CompromiseT1190 Exploit Public-Facing ApplicationT1078 Valid Accounts
Threat actor: ExternalFinancial
Regulator citations: notified, or will notify, state regulators and consumer reporting agencies
Initial access: supply_chain

During the incident: Immediately disabled external access to the software
Applied the security fix provided by the vendor
Launched an extensive investigation
Investigation with assistance from an external cybersecurity firm
Providing written notice of this incident to those impacted
Notified, or will notify, state regulators and consumer reporting agencies
Offering a two (2) year subscription to Equifax’s CompleteTM Premier service at no cost
Changes made: Applied the security fix provided by the vendor
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 29 days(29 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 · 7 filings · 7 states

View merged incident ↗

Illinois State AGJan 1 · first

Massachusetts State AG+180d

Indiana State AG+180d

Vermont State AG+180d · this page

Maine State AG+183d

New Hampshire State AG+183d

South Carolina State AG+183d

Pattern: first filing Jan 1 (IL), last Jul 3 (SC) — a 183-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/2023-06-30-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 30, 2023
Raw hash: c2f51ae3680fab2868164aa5d2c77b6808a610520bbf4cb6ba12353dcbbd5483

Linked disclosures

Regulatory filings (6) · sorted by filing gap

Reporting entityNUCOR CORPORATION

Victim entityNUCOR CORPORATION

Incidentdiscovered Jun 1, 2023

Stated responseImmediately disabled external access to the software

ComplianceVT AG >14 bday

Extraction provenanceno artifact recorded

Source provenanceago.vermont.gov