HackingProfessional ServicesProfessional ServicesVulnerability ExploitData ExfiltratedCustomer Data InvolvedIdentity (basic)Government IDFinancial accountMediumContained

Lyon Real Estate

bd_3fd1dc8854222820 · schema v1 · pii pii-v1

Severity

Medium

Discovered

May 4, 2023

Filed

Sep 6, 2023

To disclose

18 weeks

Affected

2state residents only

Linked

6 filings

Confidence

66%

Full breach record for Lyon Real Estate →

Lyon Real Estate notified 2 New Hampshire residents of a data breach occurring between April 18 and May 4, 2023. An unknown actor exploited a software vulnerability in a vendor application to access systems. Affected data included names, SSNs, and financial account numbers. Lyon engaged third-party specialists, reported to federal law enforcement, and provided credit monitoring via Equifax.

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Incident timeline

undetected · 16 days

discovery → filing · 18 weeks / 125 days

Apr 18, 2023

Begins

May 4, 2023

Discovered

Sep 6, 2023

Filed

vs. sector median

1 wks faster

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

Linked disclosures

Why this link?

Regulatory filings (5) · sorted by filing gap

California State AGbd_3e536f8381d828b62023-09-06Verified
Montana State AGbd_6401fa3db6bda0eb2023-09-06Candidate
Massachusetts State AGbd_8001ac3b78369b472023-09-06Verified
Indiana State AGbd_87467a1e3cbd2a462023-09-06Verified

Show 1 more filing ↓

Maine State AGbd_eabed48a437241c42023-09-06Verified

Name: Lyon Real Estate
norm: lyon real estate

Name: Lyon Real Estate
norm: lyon real estate
Industry: Professional Servicesllm

Discovered: May 4, 2023
Breach occurred: Apr 18, 2023 – May 4, 2023
Undetected for: 16 daysoccurrence → discovery
Materiality determined: —
Notification sent: Sep 6, 2023
Affected individuals: 2state-resident count only
Data types: Identity (basic)Government IDFinancial account
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing Application
Threat actor: External
Regulator citations: reported the event to federal law enforcementproviding written notice of this event to appropriate state regulators and to the three major consumer reporting agencies, Equifax, Experian, and TransUnion
Initial access: exploit_public_facing

During the incident: Launched an investigation into the nature and scope of the event with the assistance of third-party subject matter specialists
Reported the event to federal law enforcement
Working to implement additional safeguards and training to its employees
Providing access to credit monitoring services for one through Equifax
Providing potentially affected individuals with guidance on how to better protect against identity theft and fraud
Changes made: Reviewing and enhancing our information security policies and procedures
Procedures with respect to the integration and use of third-party software products
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 18 weeks(125 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 6 filings · 6 states

View merged incident ↗

California State AGSep 6 · first

Montana State AGSep 6 · first

Massachusetts State AGSep 6 · first

Indiana State AGSep 6 · first

Maine State AGSep 6 · first

New Hampshire State AGSep 6 · 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/lyon-real-estate-20230906.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 6, 2023
Raw hash: 4df94571bbf0b40518b068b440017b220fd33ba2c68bb2ceaa292df98ff79e0f

Linked disclosures

Regulatory filings (5) · sorted by filing gap

Reporting entityLyon Real Estate

Victim entityLyon Real Estate

Incidentdiscovered May 4, 2023

Stated responseLaunched an investigation into the nature and scope of the event with the assistance of third-party subject matter specialists

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov