Cisco discloses self-sabotaging SSD bug that causes rolling outages for some Firepower appliances Boxes stop working, admins may be locked out after 28,224 hours – and then every 1,008 hours after that Share Copy Cisco has detailed a bug that causes 43 models in its Firepower security appliance range to stop passing traffic and perhaps also prevent logins to the devices’ management console. A field notice dated May 18 explains that “due to a flaw in solid-state drive (SSD) firmware, the SSD that is internal to the FPR9300 Supervisor module and FPR4100 Series security appliances will no longer respond after approximately 3.2 years of cumulative operation.