Cisco SD-WAN Zero-Day CVE-2026-20127 Exploited Since 2023 for Admin Access

Cisco SD-WAN Zero-Day CVE-2026-20127 Exploited Since 2023 for Admin Access

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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

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