HackingTelecom & MediaInformationCustomer Data InvolvedGovernment IDIdentity (basic)MediumContained

TELEPHONE AND DATA SYSTEMS, INC.

bd_61bad7cf83045f49 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Jun 2, 2021

Filed

Jun 23, 2021

To disclose

21 days

Affected · nationwide

999 in this filing

Linked

4 filings

Confidence

66%

Full breach record for TELEPHONE AND DATA SYSTEMS, INC. →

Telephone and Data Systems, Inc. reported an external system breach (hacking) occurring on January 20, 2021, discovered on June 2, 2021. The incident affected 99 individuals, including 9 Maine residents. Personal information acquired included names and Social Security Numbers. The company provided written notification and offered 24 months of credit monitoring through Experian.

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Maine clockDiscovered Jun 2, 2021 → Filed with AG Jun 23, 202121d ✓ ME AG ≤30d21 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 · 133 days

discovery → filing · 21 days

Jan 20, 2021

Begins

Jun 2, 2021

Discovered

Jun 23, 2021

Filed

This filing is one of 4 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (3) · sorted by filing gap

Massachusetts State AGbd_6b760a3cdf9319f02021-06-23Verified
Indiana State AGbd_5b2392ef9a37b89a2021-06-24 · +1dVerified
Maine State AGbd_675d3d607620e8fc2021-08-03 · +41dVerified

Name: TELEPHONE AND DATA SYSTEMS, INC.
norm: telephone and data

Name: TELEPHONE AND DATA SYSTEMS, INC.
norm: telephone and data
Industry: Telecom & Mediallm

Discovered: Jun 2, 2021
Breach occurred: Jan 20, 2021
Undetected for: 133 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jun 24, 2021
Affected individuals: 99state + 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: External
Regulator citations: Filed data breach notice with Maine Attorney General
Initial access: exploit_public_facing

During the incident: Sent written notification to affected individuals
Offered 24 months of credit monitoring through Experian
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 21 days(21 days from discovery to filing)
Compliance flags: ME AG ≤30d · 21d
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: Jun 2, 2021
→ Filed with AG: Jun 23, 2021
21d 30 days ME AG ≤30d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: Jun 2, 2021 → Filed with AG: Jun 23, 2021	21d	30 days	ME AG ≤30d

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 4 filings · 3 states

View merged incident ↗

Massachusetts State AGJun 23 · first

Maine State AGJun 23 · first · this page

Indiana State AG+1d

Maine State AG+41d

Pattern: first filing Jun 23 (MA), last Aug 3 (ME) — a 41-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

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-a1252b4f8318/13b1e35e-1084-416e-9991-85d4317b4264.shtml
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jun 23, 2021
Raw hash: 09b0ed6b00ce90bd945d0ca6b3b23b9ee850c9f28ec7c5f600ea0779bc179e90

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityTELEPHONE AND DATA SYSTEMS, INC.

Victim entityTELEPHONE AND DATA SYSTEMS, INC.

Incidentdiscovered Jun 2, 2021

Stated responseSent written notification to affected individuals

ComplianceME AG ≤30d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov