SD-WAN

A second authentication bypass in the same vdaemon stack as February's CVE-2026-20127 carries a CVSS 10.0 and is being exploited by the same UAT-8616 cluster, Cisco and Talos disclosed on May 14.

A maximum-severity authentication bypass in Cisco Catalyst SD-WAN has been actively exploited since 2023 by a sophisticated threat actor, prompting a CISA emergency directive requiring federal agencies to patch or disconnect affected systems.