FEDERALItem 1.05 · mandatoryHackingTechnologyManufacturingManufacturingComputer HardwareStolen CredentialsNation State SuspectedData ExfiltratedMulti-Stage ChainLateral Movement ObservedDOJ-Delayed FilingTargetedIP / systemPIILowContained

F5, Inc.

bd_ace14406ea2d32b7 · schema v1 · pii pii-v1

Severity

Low

Discovered

Aug 9, 2025

Filed

Oct 15, 2025

To disclose

10 weeks

Affected

Not disclosed

Confidence

68%

Full breach record for F5, Inc. →

F5, Inc. disclosed a material cybersecurity incident where a sophisticated nation-state actor gained unauthorized access to certain systems, including the BIG-IP product development environment. The actor maintained long-term persistent access and exfiltrated files containing portions of BIG-IP source code and information about undisclosed vulnerabilities. F5 states there is no evidence of modification to the software supply chain or access to CRM/financial systems. A small percentage of customer configuration data was also exfiltrated. The DOJ granted a delay in disclosure until October 15, 2025.

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Incident timeline

discovery → filing · 10 weeks / 67 days

Aug 9, 2025

Discovered

Oct 15, 2025

Filed

vs. sector median

9 wks faster

Tracked as a single-filing incident — the only disclosure on record for this event so far.ConfirmedView incident

Name: F5, Inc.
norm: f5
SEC CIK: 0001048695
Domain: f5.com

Name: F5, Inc.
norm: f5
SEC CIK: 0001048695
Domain: f5.com
Industry: Technologynaics mapManufacturingnaics map
NAICS 334118 · Computer Terminal and Other Computer Peripheral Equipment Manufacturing

Discovered: Aug 9, 2025
Materiality determined: Oct 15, 2025
Notification sent: Oct 15, 2025
Affected individuals: Not disclosed
Data types: IP / systemPII
Attack vector: Unknown
MITRE ATT&CK: T1078 Valid AccountsT1041 Exfiltration Over C2 ChannelT1530 Data from Cloud Storage Object
Threat actor: ExternalEspionage
Regulator citations: U.S. Department of Justice determined that a delay in public disclosure was warranted pursuant to Item 1.05(c) of Form 8-K

During the incident: Activated its incident response processes
Taken extensive actions to contain the threat actor
Engaged leading external cybersecurity experts
Actively engaged with federal law enforcement and government partners
Implementing further measures to strengthen its security environment and protect its customers
Changes made: Implementing further measures to strengthen its security environment and protect its customers
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 10 weeks(67 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

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 filing

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statementThis record

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://www.sec.gov/Archives/edgar/data/1048695/000104869525000149/ffiv-20251015.htm
DisclosureLens renders the full SEC/HHS filing inline below from the originating regulator’s public record (§4.5 fair report privilege).
Filed at: Oct 15, 2025
Raw hash: 39dfa87256b517e55a0d5edd618f657a0b020c966bade096326775d747c7695c

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Reporting entityF5, Inc.

Victim entityF5, Inc.

Incidentdiscovered Aug 9, 2025

Stated responseActivated its incident response processes

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancewww.sec.gov

Source filing