HackingTechnologyManufacturingInformationStolen CredentialsCustomer Data InvolvedIdentity (basic)PIILowContained

KLA CORPORATION

bd_de2fe3a8394583b5 · schema v1 · pii pii-v1

Severity

Low

Discovered

Aug 5, 2025

Filed

Nov 7, 2025

To disclose

13 weeks

Affected

Not disclosed

Confidence

67%

Full breach record for KLA CORPORATION →2 incidents on file

KLA Instruments, a subsidiary of KLA Corporation, disclosed a data breach occurring on or around August 5, 2025, where an unauthorized party accessed corporate systems. The incident compromised personal information including names and contact details. KLA notified law enforcement, engaged forensic experts, and is offering two years of credit monitoring via IDX to affected individuals across multiple US states.

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Vermont clock✗ VT AG >45 bday13 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

discovery → filing · 13 weeks / 94 days

Aug 5, 2025

Discovered

Nov 7, 2025

Filed

vs. sector median

5 wks faster

Tracked as a single-filing incident — the only disclosure on record for this event so far.ConfirmedView incident

Name: KLA CORPORATION
norm: kla
Domain: kla.com

Name: KLA CORPORATION
norm: kla
Domain: kla.com
Industry: TechnologyllmManufacturingllm

Discovered: Aug 5, 2025
Materiality determined: —
Notification sent: Nov 7, 2025
Affected individuals: Not disclosed
Data types: Identity (basic)PII
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Regulator citations: Notified federal law enforcement
Initial access: valid_credentials

During the incident: Took immediate containment steps
Notified federal law enforcement
Worked with leading third-party forensics experts
Undertook to review files with the assistance of third-party data mining experts
Offering two years of free credit monitoring and identity protection services provided by IDX
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 13 weeks(94 days from discovery to filing)
Compliance flags: VT AG >45 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.

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/2025-11-07-kla-corporation-dba-kla-instruments-filmetrics-data-breach-notice-consumers
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Nov 7, 2025
Raw hash: 7b7fbf06d32429fd870903fe858b6d21ef52c5dbe2324c50106e140b46583c20

Reporting entityKLA CORPORATION

Victim entityKLA CORPORATION

Incidentdiscovered Aug 5, 2025

Stated responseTook immediate containment steps

ComplianceVT AG >45 bday

Extraction provenanceno artifact recorded

Source provenanceago.vermont.gov