AccidentalFinancial ServicesFinanceMisdeliveryCustomer Data InvolvedIdentity (basic)Financial accountLowResolved

Citibank N.A.

bd_1700777c7280a046 · schema v1 · pii pii-v1

Severity

Low

Discovered

Mar 27, 2017

Filed

Apr 11, 2017

To disclose

15 days

Affected

2state residents only

Linked

5 filings

Confidence

65%

Full breach record for Citibank N.A. →51 incidents on file

Citibank notified Montana residents of an accidental email misdelivery on March 27, 2017. An employee included an external recipient with a similar name on a legitimate mailing list, exposing names, addresses, and credit card account numbers. Citi closed affected accounts, reissued cards, and offered 12 months of credit monitoring. The unintended recipient deleted the email without opening it.

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Incident timeline

discovery → filing · 15 days

Mar 27, 2017

Begins

Mar 27, 2017

Discovered

Apr 11, 2017

Filed

vs. sector median

7 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

New Hampshire State AGbd_bb5a65fa71727a8f2017-04-11Verified
Massachusetts State AGbd_178ca65bb5fcf2812017-04-18 · +7dVerified
Massachusetts State AGbd_6dddf4baedcd50172017-04-18 · +7dVerified
Massachusetts State AGbd_4ef0bedccde586232017-04-20 · +9dVerified

Name: Citibank N.A.
norm: citibank na
Domain: citi.com

Name: Citibank N.A.
norm: citibank na
Domain: citi.com
Industry: Financial Servicesllm

Discovered: Mar 27, 2017
Breach occurred: Mar 27, 2017
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: Apr 11, 2017
Affected individuals: 2state-resident count only
Data types: Identity (basic)Financial account
Attack vector: Misconfiguration
MITRE ATT&CK: T1052 Exfiltration Over Physical Medium
Threat actor: Internal

During the incident: Closed your account and reissued a new credit card
Arranged for you at your option to enroll in a credit monitoring service at no cost to you for at least the next 12 months
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 15 days(15 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 5 filings · 3 states

View merged incident ↗

New Hampshire State AGApr 11 · first

Montana State AGApr 11 · first · this page

Massachusetts State AG+7d

Massachusetts State AG+9d

Pattern: first filing Apr 11 (NH), last Apr 20 (MA) — a 9-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://dojmt.gov/wp-content/uploads/Citibank.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Apr 11, 2017
Raw hash: 6933128810a449cc513d0316c5910de75a08e6f68bf247bfa5f01d2124dd957c

Linked disclosures

Regulatory filings (4) · sorted by filing gap

Reporting entityCitibank N.A.

Victim entityCitibank N.A.

Incidentdiscovered Mar 27, 2017

Stated responseClosed your account and reissued a new credit card

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov