HackingProfessional ServicesProfessional ServicesStolen CredentialsCustomer Data InvolvedTargetedIdentity (basic)Government IDFinancial accountMediumContained

Gibson, Dunn, & Crutcher LLP

bd_767bca6f1232dee9 · schema v1 · pii pii-v1

Severity

Medium

Discovered

May 31, 2023

Filed

Jul 7, 2023

To disclose

5 weeks

Affected

Not disclosed

Linked

3 filings

Confidence

65%

Full breach record for Gibson, Dunn, & Crutcher LLP →3 incidents on file

Gibson, Dunn & Crutcher LLP notified consumers of a cybersecurity incident occurring between April and May 2023 involving unauthorized access to files containing personal information. The firm engaged forensic experts and notified law enforcement. Affected data may include names, SSNs, DOBs, passport/license numbers, and account numbers. No evidence of misuse was found at the time of notice. The firm offered two years of Experian IdentityWorks.

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Vermont clock⏱ VT AG >14 bday5 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 · 60 days

discovery → filing · 5 weeks / 37 days

Apr 1, 2023

Begins

May 31, 2023

Discovered

Jul 7, 2023

Filed

vs. sector median

13 wks faster

This filing is one of 3 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (2) · sorted by filing gap

California State AGbd_9cb5c8b369e339fc2023-07-07Candidate
New Hampshire State AGbd_bd2c5a32947917642023-07-07Verified

Name: Gibson, Dunn, & Crutcher LLP
norm: gibson dunn crutcher
Domain: gibsondunn.com

Name: Gibson, Dunn, & Crutcher LLP
norm: gibson dunn crutcher
Domain: gibsondunn.com
Industry: Professional Servicesllm

Discovered: May 31, 2023
Breach occurred: Apr 1, 2023 – May 31, 2023
Undetected for: 60 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jul 7, 2023
Affected individuals: Not disclosed
Data types: Identity (basic)Government IDFinancial account
Data elements: Social Security numberDate of birth
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1119 Automated Collection
Threat actor: External
Regulator citations: notified federal law enforcement
Initial access: valid_credentials

During the incident: Launched a thorough investigation
Engaged leading cybersecurity and forensics experts
Notified federal law enforcement
Worked with leading cybersecurity and forensics experts to quickly contain the incident
Cooperating with law enforcement in their investigation
Taken additional steps to enhance our security
Offering you a complimentary two-year membership to Experian’s® IdentityWorks
Changes made: Taken additional steps to enhance our security and help prevent future incidents
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 5 weeks(37 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 · 3 filings · 3 states

View merged incident ↗

California State AGJul 7 · first

New Hampshire State AGJul 7 · first

Vermont State AGJul 7 · first · this page

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/2023-07-07-gibson-dunn-crutcher-data-breach-notice-consumers
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jul 7, 2023
Raw hash: c7c68a945dce6acd37d4705cfc09f62648f8340ad784021208c1a2a35c2081ac

Linked disclosures

Regulatory filings (2) · sorted by filing gap

Reporting entityGibson, Dunn, & Crutcher LLP

Victim entityGibson, Dunn, & Crutcher LLP

Incidentdiscovered May 31, 2023

Stated responseLaunched a thorough investigation

ComplianceVT AG >14 bday

Extraction provenanceno artifact recorded

Source provenanceago.vermont.gov