HackingHealthcareHealthcareCustomer Data InvolvedIdentity (basic)Government IDMediumResolved

Mevion Medical Systems, Inc.

bd_cd98cb902cdd7b08 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Apr 8, 2021

Filed

Jun 17, 2021

To disclose

10 weeks

Affected · nationwide

7308 in this filing

Linked

5 filings

Confidence

50%

Full breach record for Mevion Medical Systems, Inc. →

Mevion Medical Systems, a healthcare technology company, reported an external system breach (hacking) that occurred on March 28, 2021, and was discovered on April 8, 2021. The breach compromised the names and Social Security numbers of 730 individuals, including 8 Maine residents. The company provided written notification to the affected individuals on June 17, 2021, and offered 24 months of identity monitoring services through Experian.

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Maine clockDiscovered Apr 8, 2021 → Filed with AG Jun 17, 202170d ⏱ ME AG >30d10 weeks 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 · 11 days

discovery → filing · 10 weeks / 70 days

Mar 28, 2021

Begins

Apr 8, 2021

Discovered

Jun 17, 2021

Filed

vs. sector median

3 wks faster

This filing is one of 5 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (4) · sorted by filing gap

Montana State AGbd_7e7d32019136fbc02021-06-17Candidate
Massachusetts State AGbd_d48161f16b6959192021-06-17Verified
Indiana State AGbd_eb265913f6d9a55f2021-06-17Verified
New Hampshire State AGbd_b2c548c8089047042021-06-21 · +4dVerified

Name: Mevion Medical Systems, Inc.
norm: mevion medical

Name: Mevion Medical Systems, Inc.
norm: mevion medical
Industry: Healthcarellm

Discovered: Apr 8, 2021
Breach occurred: Mar 28, 2021
Undetected for: 11 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jun 17, 2021
Affected individuals: 730state + nationwide
Data types: Identity (basic)Government ID
Data elements: Social Security number
Attack vector: Unauthorized Access
Threat actor: External

Changes made: Offered 24 months of identity monitoring services from Experian.
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 10 weeks(70 days from discovery to filing)
Compliance flags: ME AG >30d · 70d
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: Apr 8, 2021
→ Filed with AG: Jun 17, 2021
70d 30 days (soft) ME AG >30d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: Apr 8, 2021 → Filed with AG: Jun 17, 2021	70d	30 days (soft)	ME AG >30d

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 5 filings · 5 states

View merged incident ↗

Montana State AGJun 17 · first

Massachusetts State AGJun 17 · first

Indiana State AGJun 17 · first

Maine State AGJun 17 · first · this page

New Hampshire State AG+4d

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/a599b49a-d267-4aa7-aedc-50ba88a61f7b.shtml
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jun 17, 2021
Raw hash: 7a0e6a0018694bd34e0ba4fe27f5abab3547696b9d18a7ab1d0fef7879f57a27

Linked disclosures

Regulatory filings (4) · sorted by filing gap

Reporting entityMevion Medical Systems, Inc.

Victim entityMevion Medical Systems, Inc.

Incidentdiscovered Apr 8, 2021

Stated responseOffered 24 months of identity monitoring services from Experian.

ComplianceME AG >30d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov