HackingProfessional ServicesProfessional ServicesVulnerability ExploitData ExfiltratedTargetedIdentity (basic)LowContained

MARSH & MCLENNAN COMPANIES, INC.

bd_983239faa8378189 · schema v1 · pii pii-v1

Severity

Low

Discovered

Apr 26, 2021

Filed

Jun 30, 2021

To disclose

9 weeks

Affected

256state 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 where an unauthorized actor exploited a vulnerability in third-party software between April 22 and April 30, 2021. The incident involved personal information including names. Marsh McLennan notified law enforcement, restricted access, and offered credit monitoring.

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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
South Carolina State AGbd_f54cc90d7abb48352021-06-30Verified
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: 256state-resident count only
Data types: Identity (basic)
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1190 Exploit Public-Facing ApplicationT1195 Supply Chain Compromise
Threat actor: External
Initial access: exploit_public_facing

During the incident: Notified law enforcement
Resetting IT administrator access rights
Imposing additional restrictions on access to various systems on our network
Engaged Experian to provide IdentityWorks service
Changes made: Resetting IT administrator access rights
Imposing additional restrictions on access to various systems on our network
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 9 weeks(65 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

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

South Carolina State AGJun 30 · first

California State AGJun 30 · first

Montana 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://dojmt.gov/wp-content/uploads/marshSamp.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: cabf695500f6a88992205a1c05807590ddf0e967b4f8f4c46d7ce2cefbcda90f

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

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov