HackingFinancial ServicesProfessional ServicesFinanceVulnerability ExploitData ExfiltratedTargetedFinancial accountHealth (basic)Identity (basic)Government IDPHIHighContained

MARSH & MCLENNAN COMPANIES, INC.

bd_5f0d93b73a89ebf1 · schema v1 · pii pii-v1

Severity

High

Discovered

Apr 26, 2021

Filed

Jun 30, 2021

To disclose

9 weeks

Affected

2,550state residents only

Linked

9 filings

Confidence

71%

Full breach record for MARSH & MCLENNAN COMPANIES, INC. →6 incidents on file

Marsh McLennan notified Washington AG of a cyberattack where an unauthorized actor exploited a third-party software vulnerability between April 22-30, 2021. Discovered April 26, 2021. Affected 2,550 WA residents, exposing names, SSNs, IDs, passports, and health insurance data. Marsh McLennan engaged FBI, reset admin rights, and offered 2 years of credit monitoring.

J jump to incidentP pin to compareR raw source

Washington clock⏱ WA AG >30d9 weeks 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 · 4 days

discovery → filing · 9 weeks / 65 days

Apr 22, 2021

Begins

Apr 26, 2021

Discovered

Jun 30, 2021

Filed

vs. sector median

+1 wks slower

This filing is one of 9 filings about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (8) · sorted by filing gap

Indiana State AGbd_6e3adec13e9426862021-06-30Verified by operator
New Hampshire State AGbd_7ce38a76e14396742021-06-30Verified
Montana State AGbd_983239faa83781892021-06-30Verified
South Carolina State AGbd_f54cc90d7abb48352021-06-30Verified

Show 4 more filings ↓up to 183d gap

California State AGbd_fa303094cee7b57b2021-06-30Verified
Oregon State AGbd_e9678b0aaa98aeb82021-07-01 · +1dVerified
Massachusetts State AGbd_84205fabab6f7b632021-07-06 · +6dVerified by operator
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: Financial ServicesllmProfessional 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: 2,550state-resident count only
Data types: Financial accountHealth (basic)Identity (basic)Government IDPHI
Data elements: NameSocial Security numberDriver's licence numberPassport numberHealth insurance ID
WA-stated cause: Cyberattack
WA-stated duration: lifecycle 1-99dexposure 1-99d
WA-stated discovery: Found while ongoing
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing ApplicationT1078 Valid Accounts
Threat actor: External
Regulator citations: Notified the U.S. Federal Bureau of Investigation
Initial access: exploit_public_facing

During the incident: Launched an investigation
Took measures to restrict any further unauthorized activity or access to data
Resetting IT administrator access rights
Imposing additional restrictions on access to various systems on the network
Taking additional steps to further harden its networks and systems and further strengthen overall security posture
Notified the U.S. Federal Bureau of Investigation
Changes made: Resetting IT administrator access rights
Imposing additional restrictions on access to various systems on the network
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: WA AG >30d
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.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 9 filings · 9 states

View merged incident ↗

Indiana State AGJun 30 · first

New Hampshire State AGJun 30 · first

Montana State AGJun 30 · first

South Carolina State AGJun 30 · first

California State AGJun 30 · first

Washington State AGJun 30 · first · this page

Oregon State AG+1d

Massachusetts State AG+6d

Maine State AG+183d

Pattern: first filing Jun 30 (IN), 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://agportal-s3bucket.s3.amazonaws.com/databreach/BreachM10492.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: d35990e9e9b197fc5021405fb270edade094a0fde9072064bb42ebe7674a8476

Linked disclosures

Regulatory filings (8) · sorted by filing gap

Reporting entityMARSH & MCLENNAN COMPANIES, INC.

Victim entityMARSH & MCLENNAN COMPANIES, INC.

Incidentdiscovered Apr 26, 2021

Stated responseLaunched an investigation

ComplianceWA AG >30d

Extraction provenanceno artifact recorded

Source provenanceagportal-s3bucket.s3.amazonaws.com