UNC6521 is a apt_group tracked across 1 threat cluster and 1 intelligence report mention on ThreatCluster. First observed October 29, 2025; most recent activity October 29, 2025.
Microsoft has released an out-of-band security update for a critical vulnerability, CVE-2025-59287, in Windows Server Update Services (WSUS) that allows unauthenticated remote code execution. The vulnerability, stemming…