F5

Disclosed Oct 15, 2025Confirmed

Nation-state hackers steal F5 BIG-IP source code and bug details

F5 told the SEC a nation-state actor had long-term access to its BIG-IP development environment and knowledge systems, stealing source code, undisclosed vulnerability details and some customer configuration data; it learned of the intrusion on August 9, 2025 and CISA issued an emergency directive.

What is known

People affected	Not stated in the sources we have
Disclosed	Oct 15, 2025
Discovered	Aug 9, 2025
Attack	Hacking
Data exposed	Source codeInternal documentsOther
Sector	Tech · US
Status	Confirmed

Sources

SEC filingsec.gov

F5, Inc. Form 8-K, Item 1.05 (2025-10-15)

Newstechcrunch.com

Cyber giant F5 Networks says government hackers had long-term access to its systems

Notices filed

TotalOct 15, 2025

SEC 8-KCount not stated

TotalOct 15, 2025

ResearchCount not stated

History of this record

attack2026-09-25

unknown to hackingby seedSource

data_types2026-09-25

[] to ["source-code","internal-docs","other"]by seedSource

discovered2026-09-25

empty to 2025-08-09by seedSource

summary2026-09-25

empty to F5 told the SEC a nation-state actor had long-term access to its BIG-IP development environment and knowledge systems, stealing source code, undisclosed vulnerability details and some customer configuration data; it learned of the intrusionby seedSource

title2026-09-25

Material cybersecurity incident reported to the SEC (8-K Item 1.05) to Nation-state hackers steal F5 BIG-IP source code and bug detailsby seedSource

Added2026-09-25

First recordedby backfillSource

First seen 2026-09-25 (SEC 8-K), confirmed by SEC 8-K. Record counts are as reported. Not legal advice.

Everything about F5