UPDATED: Damning Report Has AMD Investigating Critical Vulnerabilities in Ryzen, EPYC Chips

**Executive summary:** CTS‑Labs publicly disclosed four critical vulnerabilities (Ryzenfall, Masterkey, Fallout, Chimera) affecting AMD EPYC/Ryzen processor families that, according to the researchers, could allow persistent firmware‑level backdoors, theft of network credentials (bypassing features like Windows Credential Guard), and administrative compromise via an ASMedia chipset flaw; AMD is investigating and researchers shared PoCs with select vendors but no public technical details or proof of in‑the‑wild exploitation were provided.