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Serious F5 Breach

ID: f0769088-8af0-5a7f-9e9d-2131e3aced02

STIX ID: report--f0769088-8af0-5a7f-9e9d-2131e3aced02

Feed Name: Schneier on Security

Threat Score
92/100

Date Published: 2025-10-23

Date Updated: 2026-04-19

Author: Bruce Schneier

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F5 disclosed a sophisticated, long-term breach by a likely nation-state group that gained control of the build/distribution systems for BIG-IP, exfiltrating proprietary source code, unpatched-vulnerability details, and customer configuration data—raising severe supply-chain and targeted exploitation risks for thousands of networks, including major enterprises.

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