HackingProfessional ServicesProfessional ServicesStolen CredentialsSupply Chain (3P Vendor)Data ExfiltratedIdentity (basic)MediumContained

MARSH & MCLENNAN COMPANIES, INC.

bd_f54cc90d7abb4835 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Apr 26, 2021

Filed

Jun 30, 2021

To disclose

9 weeks

Affected

1,090state residents only

Linked

7 filings

Confidence

64%

Full breach record for MARSH & MCLENNAN COMPANIES, INC. →7 incidents on file

Marsh McLennan notified individuals of a data breach discovered on April 26, 2021, involving unauthorized access to a limited set of data via a third-party software vulnerability. Access occurred between April 22 and April 30, 2021. The incident involved names and other personal information. Marsh McLennan notified law enforcement, terminated access, reset IT admin rights, and offered two years of credit monitoring through Experian. Rhode Island residents (532) were explicitly counted.

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South Carolina clock✓ SC CRA notice due9 weeks 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 · 4 days

discovery → filing · 9 weeks / 65 days

Apr 22, 2021

Begins

Apr 26, 2021

Discovered

Jun 30, 2021

Filed

vs. sector median

9 wks faster

This filing is one of 7 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (6) · sorted by filing gap

Washington State AGbd_5f0d93b73a89ebf12021-06-30Candidate
New Hampshire State AGbd_7ce38a76e14396742021-06-30Verified
Montana State AGbd_983239faa83781892021-06-30Verified
California State AGbd_fa303094cee7b57b2021-06-30Verified

Show 2 more filings ↓up to 183d gap

Oregon State AGbd_e9678b0aaa98aeb82021-07-01 · +1dVerified
Maine State AGbd_8767e869d58fdbbb2021-12-30 · +183dVerified

Name: MARSH & MCLENNAN COMPANIES, INC.
norm: marsh mclennan companies

Name: MARSH & MCLENNAN COMPANIES, INC.
norm: marsh mclennan companies
Industry: Professional Servicesllm

Discovered: Apr 26, 2021
Breach occurred: Apr 22, 2021 – Apr 30, 2021
Undetected for: 4 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jun 30, 2021
Affected individuals: 1,090state-resident count only
Data types: Identity (basic)
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1195 Supply Chain CompromiseT1190 Exploit Public-Facing Application
Threat actor: External
Regulator citations: Notified law enforcement
Initial access: exploit_public_facing

During the incident: Notified law enforcement
Terminated the unauthorized actor’s access
Prevented future access
Resetting IT administrator access rights
Imposing additional restrictions on access to various systems on our network
Engaged Experian to provide IdentityWorks service
Changes made: Offered complimentary two-year credit monitoring service through Experian
Provided identity theft detection and resolution services
Provided up to $1 million of identity theft insurance
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 9 weeks(65 days from discovery to filing)
Compliance flags: SC CRA notice due
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.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 7 filings · 7 states

View merged incident ↗

Washington State AGJun 30 · first

New Hampshire State AGJun 30 · first

Montana State AGJun 30 · first

California State AGJun 30 · first

South Carolina State AGJun 30 · first · this page

Oregon State AG+1d

Maine State AG+183d

Pattern: first filing Jun 30 (WA), last Dec 30 (ME) — a 183-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://consumer.sc.gov/sites/consumer/files/Documents/Business%20Resources%20Laws/Related%20Laws/Breaches/2021/MarshMcLennan.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jun 30, 2021
Raw hash: 2b7a8f67205bd8968ebe8f2a020c9fe685797f05dbc8cef84e5501f6d08addc0

Linked disclosures

Regulatory filings (6) · sorted by filing gap

Reporting entityMARSH & MCLENNAN COMPANIES, INC.

Victim entityMARSH & MCLENNAN COMPANIES, INC.

Incidentdiscovered Apr 26, 2021

Stated responseNotified law enforcement

ComplianceSC CRA notice due

Extraction provenanceno artifact recorded

Source provenanceconsumer.sc.gov