F5
Disclosed Oct 15, 202511 months agoConfirmed
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 code, Internal documents, Other |
| Sector | Tech · US |
| Status | Confirmed |
Sources
| Source | |
|---|---|
| F5, Inc. Form 8-K, Item 1.05 (2025-10-15)sec.gov · SEC filing | SEC filing |
| Cyber giant F5 Networks says government hackers had long-term access to its systemstechcrunch.com · News | News |
Notices filed
History of this record
- 2026-09-25 · attack: unknown to hacking · seed source
- 2026-09-25 · data_types: [] to ["source-code","internal-docs","other"] · seed source
- 2026-09-25 · discovered: empty to 2025-08-09 · seed source
- 2026-09-25 · summary: 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 intrusion · seed source
- 2026-09-25 · title: Material cybersecurity incident reported to the SEC (8-K Item 1.05) to Nation-state hackers steal F5 BIG-IP source code and bug details · seed source
- 2026-09-25 · added · backfill source
First seen 2026-09-25 (SEC 8-K), confirmed by SEC 8-K. Record counts are as reported. Not legal advice.