FORT MEADE, Md. – The National Security Agency (NSA) is joining the Cybersecurity and Infrastructure Security Agency (CISA) and others to release the Cybersecurity Information Sheet (CSI), “Bulletproof Defense: Mitigating Risks from Bulletproof Hosting Providers,” to provide internet service providers (ISPs) and network defenders recommendations to mitigate potential cybercriminal activity enabled by bulletproof hosting (BPH) providers.