HackingTelecom & MediaInformationCustomer Data InvolvedData ExfiltratedIdentity (basic)Financial accountFinancial credentialsLow

US Cellular

bd_c9f7dcb4be9dd768 · schema v1 · pii pii-v1

Severity

Low

Discovered

Jan 6, 2021

Filed

Jan 22, 2021

To disclose

16 days

Affected · nationwide

2761 in this filing

Linked

3 filings

Confidence

65%

Full breach record for US Cellular →3 incidents on file

USCellular experienced an external system breach on January 4, 2021, which was discovered on January 6, 2021. The incident affected 276 individuals and compromised names along with financial account or credit/debit card numbers combined with security codes or PINs. The company notified the affected individuals in writing on January 21, 2021.

J jump to incidentP pin to compareR raw source

Maine clockDiscovered Jan 6, 2021 → Filed with AG Jan 22, 202116d ✓ ME AG ≤30d16 days discovery → filing

⚠ unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Incident timeline

undetected · 2 days

discovery → filing · 16 days

Jan 4, 2021

Begins

Jan 6, 2021

Discovered

Jan 22, 2021

Filed

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

Oregon State AGbd_8e201178f23c79152021-01-22Candidate
New Hampshire State AGbd_a6fee6ab93e3d4df2021-01-25 · +3dVerified

Name: US Cellular
norm: us cellular

Name: US Cellular
norm: us cellular
Industry: Telecom & Mediallm

Discovered: Jan 6, 2021
Breach occurred: Jan 4, 2021
Undetected for: 2 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jan 21, 2021
Affected individuals: 276state + nationwide
Data types: Identity (basic)Financial accountFinancial credentials
Data elements: Financial account number
Attack vector: Unauthorized Access
Threat actor: ExternalFinancial

During the incident: Sent written notification to affected consumers
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 16 days(16 days from discovery to filing)
Compliance flags: ME AG ≤30d · 16d
Discovery-date grounding: unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.
Clock breakdown: Statute Window Elapsed Threshold Status
Maine
Discovered: Jan 6, 2021
→ Filed with AG: Jan 22, 2021
16d 30 days ME AG ≤30d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: Jan 6, 2021 → Filed with AG: Jan 22, 2021	16d	30 days	ME AG ≤30d

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 3 filings · 3 states

View merged incident ↗

Oregon State AGJan 22 · first

Maine State AGJan 22 · first · this page

New Hampshire State AG+3d

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-a1252b4f8318/26c4a7ea-d78e-47a0-9ebc-886e6c911dac.shtml
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jan 22, 2021
Raw hash: e53007e1ab7e00dab42a49c2a67a227782afdbc13e3ce484d7fed00d7845a28c

Linked disclosures

Regulatory filings (2) · sorted by filing gap

Reporting entityUS Cellular

Victim entityUS Cellular

Incidentdiscovered Jan 6, 2021

Stated responseSent written notification to affected consumers

ComplianceME AG ≤30d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov