HackingProfessional ServicesProfessional ServicesCustomer Data InvolvedPIIIdentity (basic)LowContained

Gibson, Dunn, & Crutcher LLP

bd_bd2c5a3294791764 · schema v1 · pii pii-v1

Severity

Low

Discovered

May 1, 2023

Filed

Jul 7, 2023

To disclose

10 weeks

Affected

5state residents only

Linked

3 filings

Confidence

66%

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

Gibson, Dunn & Crutcher LLP reported a cybersecurity incident involving unauthorized third-party access to files containing personal information of approximately 5 New Hampshire residents. The incident occurred between April and May 2023. The firm engaged forensic experts, notified the FBI, and contained the incident. No evidence of misuse was found. Affected individuals were offered Experian IdentityWorks membership.

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Incident timeline

undetected · 30 days

discovery → filing · 10 weeks / 67 days

Apr 1, 2023

Begins

May 1, 2023

Discovered

Jul 7, 2023

Filed

vs. sector median

9 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

Vermont State AGbd_767bca6f1232dee92023-07-07Verified
California State AGbd_9cb5c8b369e339fc2023-07-07Candidate

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 1, 2023
Breach occurred: Apr 1, 2023 – May 31, 2023
Undetected for: 30 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jul 7, 2023
Affected individuals: 5state-resident count only
Data types: PIIIdentity (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Regulator citations: Notified the Office of the Attorney General of New Hampshire

During the incident: Launched an investigation
Engaged leading outside cybersecurity and forensics experts
Notified the Federal Bureau of Investigation
Cooperating with the FBI’s investigation
Offering a complimentary membership to Experian’s® IdentityWorksSM
Changes made: Taken additional steps to help prevent future security incidents
Worked with leading cybersecurity and forensics experts to quickly contain the incident
Taken additional steps to enhance our security
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 10 weeks(67 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 3 filings · 3 states

View merged incident ↗

Vermont State AGJul 7 · first

California State AGJul 7 · first

New Hampshire 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://mm.nh.gov/files/uploads/doj/remote-docs/gibson-dunn-crutcher-20230707.pdf
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: 64225e6c669335744fc08da45679931a0463dcdc0bd17bca7f5a9d8d5f18103a

Linked disclosures

Regulatory filings (2) · sorted by filing gap

Reporting entityGibson, Dunn, & Crutcher LLP

Victim entityGibson, Dunn, & Crutcher LLP

Incidentdiscovered May 1, 2023

Stated responseLaunched an investigation

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov