HackingProfessional ServicesProfessional ServicesVulnerability ExploitSupply Chain (3P Vendor)Data ExfiltratedCustomer Data InvolvedGovernment IDIdentity (basic)MediumContained

MARSH & MCLENNAN COMPANIES, INC.

bd_7ce38a76e1439674 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Apr 26, 2021

Filed

Jun 30, 2021

To disclose

9 weeks

Affected

485state residents only

Linked

7 filings

Confidence

66%

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

Marsh McLennan notified the New Hampshire Attorney General on June 30, 2021, regarding a breach discovered on April 26, 2021. An unauthorized actor exploited a vulnerability in third-party software between April 22 and April 30, 2021, to access personal information of 485 New Hampshire residents. Affected data included names, SSNs, driver's license numbers, and passport information. Marsh McLennan notified the FBI, reset access rights, and is offering two years of credit monitoring via Experian.

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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
Montana State AGbd_983239faa83781892021-06-30Verified
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: 485state-resident count only
Data types: Government IDIdentity (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing ApplicationT1195 Supply Chain Compromise
Threat actor: External
Regulator citations: Notified the U.S. Federal Bureau of Investigation
Initial access: exploit_public_facing

During the incident: Notified the U.S. Federal Bureau of Investigation
Resetting IT administrator access rights
Imposing additional restrictions on access to various systems on the network
Changes made: Taking additional steps to further harden its networks and systems and further strengthen overall security posture
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

Montana State AGJun 30 · first

South Carolina State AGJun 30 · first

California State AGJun 30 · first

New Hampshire 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://mm.nh.gov/files/uploads/doj/remote-docs/marsh-mclennan-20210630.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: f0dba8e02bcbeffdd05957c40fc4c8f4b5e0bdd9a80404a53a0815e2cebf90fa

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 the U.S. Federal Bureau of Investigation

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov