HackingOtherCustomer Data InvolvedGovernment IDIdentity (basic)HighContained

21c Museum Hotels

bd_917bfc3a395d266c · 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

65%

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

21c Museum Hotels reported an external system breach (hacking) occurring between Feb 25 and Mar 17, 2021, discovered on May 4, 2021. The incident affected 2,333 individuals, including 1 Maine resident. Compromised data included names and Social Security Numbers. The company provided 24 months of credit monitoring and identity theft restoration services via Kroll.

J jump to incidentP pin to compareR raw source

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

vs. sector median

4 wks faster

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

Name: Greenberg Traurig, P.A.
norm: greenberg traurig

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

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-a1252b4f8318/2bf444a6-5af9-4483-89eb-d915e9570381.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: dd8a01fdb4badaf71fd00514ffc580adc7ff7c902f23f9214b07195293fd2f35

Reporting entityGreenberg Traurig, P.A.

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