https://reddit.com/r/cybersecurity/comments/1roymjh/cve202620127_cisco_sdwan_cvss_10_has_been/: CVE-2026-20127 (Cisco SD-WAN, CVSS 10) has been actively exploited since 2023 — wrote up the full breakdown with POAM language and compromise assessment steps

Published Mar 9, 2026

Updated

Affected Software

1 affected component

Cisco SD-WAN

CVE-2026-20127 has a CVSS score of 10, indicating it is a critical authentication bypass vulnerability.

To mitigate CVE-2026-20127, apply the latest security updates provided by Cisco for your SD-WAN environment.

CVE-2026-20127 affects Cisco SD-WAN installations that have not been updated to address this vulnerability.

CVE-2026-20127 has been actively exploited by attackers since at least 2023, enabling unauthorized access to affected systems.

Organizations should immediately assess their Cisco SD-WAN deployments and apply patches while implementing strong access controls.