CVE-2025-52665 is a chained three-vulnerability exploit in Ubiquiti UniFi OS Server allowing an unauthenticated attacker to achieve root-level remote code execution with no credentials required. CVSS 9.8 Critical, EPSS at the 96.4th percentile. Bishop Fox has published detailed technical analysis of the exploit chain, significantly lowering the bar for exploitation. Any UniFi OS device with its management interface exposed to untrusted networks should be treated as immediately at risk.