HackingHospitalityHospitalityCustomer Data InvolvedData ExfiltratedGovernment IDIdentity (basic)HighContained

21c Museum Hotels

bd_c465f8ab9bb6e5d7 · schema v1 · pii pii-v1

Severity

High

Discovered

May 4, 2021

Filed

Jun 2, 2021

To disclose

29 days

Affected · nationwide

2,3331 in this filing

Confidence

66%

Full breach record for 21c Museum Hotels →6 incidents on file

21c Museum Hotels LLC reported an external system breach (hacking) occurring between February 25, 2021, and March 17, 2021, discovered on May 4, 2021. The incident compromised names and Social Security Numbers of 2,333 individuals, including one Maine resident. The company provided written notification on June 2, 2021, and offered 24 months of credit monitoring and identity theft restoration services through Kroll.

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Maine clockDiscovered May 4, 2021 → Filed with AG Jun 2, 202129d ✓ ME AG ≤30d29 days discovery → filing

⚠ AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.

Incident timeline

undetected · 68 days

discovery → filing · 29 days

Feb 25, 2021

Begins

May 4, 2021

Discovered

Jun 2, 2021

Filed

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed2,333 affectedView incident

Name: 21c Museum Hotels
norm: 21c museum hotels
Domain: 21cmuseumhotels.com

Name: 21c Museum Hotels
norm: 21c museum hotels
Domain: 21cmuseumhotels.com
Industry: Hospitalityllm

Discovered: May 4, 2021
Breach occurred: Feb 25, 2021 – Mar 17, 2021
Undetected for: 68 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jun 2, 2021
Affected individuals: 2,333state + nationwide
Data types: Government IDIdentity (basic)
Data elements: Social Security number
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing Application
Threat actor: ExternalFinancial
Regulator citations: Filed data breach notice with Maine Office of the Attorney General
Initial access: exploit_public_facing

During the incident: Sent written notification to affected individuals
Offered 24 months of credit monitoring and identity theft restoration services through Kroll
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 29 days(29 days from discovery to filing)
Compliance flags: ME AG ≤30d · 29d
Discovery-date grounding: AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.
Clock breakdown: Statute Window Elapsed Threshold Status
Maine
Discovered: May 4, 2021
→ Filed with AG: Jun 2, 2021
29d 30 days ME AG ≤30d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: May 4, 2021 → Filed with AG: Jun 2, 2021	29d	30 days	ME AG ≤30d

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://www.maine.gov/agviewer/content/ag/985235c7-cb95-4be2-8792-a1252b4f8318/23ed181b-ab3c-49f7-b7fc-efda9ebc2f04.shtml
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jun 2, 2021
Raw hash: 75bff621892e85cecbfd32fc78855c90975061251747a0321bcd19449a640b13

Reporting entity21c Museum Hotels

Victim entity21c Museum Hotels

Incidentdiscovered May 4, 2021

Stated responseSent written notification to affected individuals

ComplianceME AG ≤30d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov