Singapore Launches Largest-Ever Cyber Defense Operation After UNC3886 Targets All Major Telcos

Singapore mounted its largest coordinated cyber defense operation (Operation Cyber Guardian) after UNC3886, a China-linked APT, carried out a targeted campaign against the country’s four major telcos by exploiting a zero‑day vulnerability; the multi‑agency response contained the intrusion, limited data theft of technical information, and prevented disruption of services, but highlighted the persistent risk to critical infrastructure.