HackingProfessional ServicesProfessional ServicesVulnerability ExploitStolen CredentialsZero-DayData ExfiltratedRansom DemandedMulti-Stage ChainTargetedIdentity (basic)Government IDHealth (basic)CVE-2021-27852MediumContained

Aon

bd_bed97e68b6fb0b6c · schema v1 · pii pii-v1

Severity

Medium

Discovered

Feb 25, 2022

Filed

May 31, 2022

To disclose

14 weeks

Affected

233state residents only

Linked

14 filings

Confidence

66%

Full breach record for Aon →11 incidents on file

Aon Corporation PLC notified the New Hampshire Attorney General of a cyber event affecting approximately 233 NH residents. Unauthorized access occurred between Dec 29, 2020, and Feb 26, 2022, exploiting a zero-day vulnerability (CVE-2021-27852). The attacker staged and exfiltrated unstructured data from SharePoint and Outlook, including names, SSNs, and driver's license numbers. Aon settled with the attacker, who deleted the data. Aon provided 24 months of credit monitoring and enhanced security controls.

J jump to incidentP pin to compareR raw source

Incident timeline

undetected · 423 days

discovery → filing · 14 weeks / 95 days

Dec 29, 2020

Begins

Feb 25, 2022

Discovered

May 31, 2022

Filed

vs. sector median

4 wks faster

This filing is one of 14 about the same incident.View merged incident

Linked disclosures

Why this link?

Ransomware claims (1)

Leak Sitedispossessorbd_d4e9fb69d737f7a62022-07-03 · +33dVerified by operator

Regulatory filings (9) · sorted by filing gap

Indiana State AGbd_fde32f8598ecaa8b2022-05-27 · +4dVerified
HHS OCRbd_1659c519cbbc91942022-05-26 · +5dVerified by operator
Oregon State AGbd_a34b45e6fa897e082022-05-26 · +5dVerified
California State AGbd_a3a4b3bd3ddac8fc2022-05-26 · +5dVerified

Show 5 more filings ↓up to 31d gap

Maine State AGbd_bdef13158191852d2022-05-26 · +5dCandidate
New Hampshire State AGbd_5ba6400246ccb57f2022-06-13 · +13dVerified by operator
Montana State AGbd_f3bea3092e6d8ecc2022-06-13 · +13dVerified by operator
Maine State AGbd_ee7cfc9886fcd7132022-06-24 · +24dCandidate
Maine State AGbd_83344b1fed7fdb7a2022-07-01 · +31dCandidate

Showing first 10 of 13 linked disclosures.

Name: Aon
norm: aon
Domain: aon.com

Name: Aon
norm: aon
Domain: aon.com
Industry: Professional Servicesllm

Discovered: Feb 25, 2022
Breach occurred: Dec 29, 2020 – Feb 26, 2022
Undetected for: 423 daysoccurrence → discovery
Materiality determined: —
Notification sent: May 27, 2022
Affected individuals: 233state-resident count only
Data types: Identity (basic)Government IDHealth (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing ApplicationT1078 Valid AccountsT1074 Data StagedT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Regulator citations: Reported the event to federal law enforcement
Initial access: exploit_public_facing
CVE references: CVE-2021-27852

During the incident: Engaged third-party advisors, incident response professionals and counsel
Reported the event to federal law enforcement
Disclosed this event in an 8-K filing
Engaging external security experts to investigate the event
Enhancing security, including upgrading and expanding internal and external multi factor authentication (MFA)
Reviewing and updating account permissions
Resetting user passwords firm-wide
Enhancing security by deploying CrowdStrike Falcon, a leading Endpoint Protection Platform
Changes made: Offering 24 months of complimentary credit monitoring and fraud protection services
Providing a toll-free hotline for the individuals to call
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 14 weeks(95 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 10 filings · 7 states

View merged incident ↗

HHS OCRMay 26 · first

Oregon State AGMay 26 · first

California State AGMay 26 · first

Maine State AGMay 26 · first

Indiana State AG+1d

New Hampshire State AG+5d · this page

New Hampshire State AG+18d

Montana State AG+18d

Maine State AG+29d

Maine State AG+36d

Pattern: first filing May 26 (IL), last Jul 1 (ME) — a 36-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

Cascade drawn from the first 10 linked disclosures of 13 — the full spread may be wider.

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/aon-20220531.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: May 31, 2022
Raw hash: 284874850856aab0239583e769ab5f58d11b707b3f893b10d0e6388aa9fa50ba

Linked disclosures

Ransomware claims (1)

Regulatory filings (9) · sorted by filing gap

Reporting entityAon

Victim entityAon

Incidentdiscovered Feb 25, 2022

Stated responseEngaged third-party advisors, incident response professionals and counsel

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov