A newly disclosed maximum-severity security flaw in Cisco Catalyst SD-WAN Controller (formerly vSmart) and Catalyst SD-WAN Manager (formerly vManage) has come under active exploitation in the wild as part of malicious activity that dates back to 2023. The vulnerability, tracked as CVE-2026-20127 (CVSS score: 10.0), allows an unauthenticated remote attacker to bypass authentication and obtain administrative privileges on an affected system by sending a crafted request. Cisco credited the Australian Signals Directorate's Australian Cyber Security Centre (ASD-ACSC) for reporting the vulnerability. The networking equipment major is tracking the exploitation and subsequent post-compromise activity under the moniker UAT-8616, describing the cluster as a "highly sophisticated cyber threat actor." Read more