Cisco SD-WAN CVE-2026-20127: CVSS 10 Bypass, ED 26-03
If you run on-prem Catalyst SD-WAN control components, upgrade and hunt now: a sophisticated actor has used this bypass for years, and the follow-on SD-WAN bugs CISA keeps adding to KEV show the platform is still being targeted.
Must act: Owners of on-prem or Cisco-hosted Catalyst SD-WAN Controller, Manager or Validator deployments, especially with ports 22/830 or the web UI reachable from untrusted networks.
Can relax: Organizations without Cisco Catalyst SD-WAN; branch routers alone are not the vulnerable component.
- Snapshot control components and collect logs before changing anything
- Upgrade Controller, Manager and Validator to a fixed release from Cisco's advisory
- Restrict ports 22 and 830 to known controller IPs and trusted hosts