Versa Concerto SD-WAN Authentication Bypass

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What is the Vulnerability?

A critical security vulnerability (CVE-2025-34026) has been identified in the Versa Concerto SD-WAN orchestration platform, impacting versions 12.1.2 through 12.2.0. The issue allows unauthorized actors to bypass standard authentication controls and access internal management components. If exploited, this vulnerability could expose sensitive system information and increase the risk of broader platform compromise, making it a high-priority security concern.

The vulnerability originates from a configuration weakness in the platform’s reverse proxy layer, which improperly permits unauthenticated access to restricted administrative interfaces. Once inside, an attacker could reach internal diagnostic endpoints that may disclose detailed runtime data, configuration information, and system artifacts. This information could be leveraged to facilitate further intrusion, escalate privileges, or undermine the integrity and confidentiality of the environment.

CVE-2025-34026 was flagged for urgent attention and added to the CISA Known Exploited Vulnerabilities Catalog.

What is the recommended Mitigation?

Organizations are advised to apply vendor patches, restrict access to orchestration interfaces, and implement protective controls such as network segmentation and strict administrative access policies to limit exposure.

What FortiGuard Coverage is available?

• FortiGuard Intrusion Prevention System (IPS) Service: FortiGuard IPS Service is available to detect and block exploit attempts targeting CVE-2025-34026. Intrusion Prevention | FortiGuard Labs
• FortiGuard Antivirus & Behavior Detection: Delivers protection against known malware and uses advanced behavioral analysis to detect and block unknown threats.
• Indicators of Compromise (IOCs) Service: The FortiGuard team is continuously monitoring for emerging threats and new IOCs.
• FortiGuard Incident Response: Organizations suspecting a compromise can contact the FortiGuard Incident Response team for rapid investigation and remediation support.

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