CVE-2025-34026: Versa Concerto Improper Authentication Vulnerability

High severity, CVSS 7.5. Actively exploited: in CISA KEV since 2026-01-22. EPSS: 81.9% chance of exploitation in the next 30 days.

The Versa Concerto SD-WAN orchestration platform is vulnerable to an authentication bypass in the Traefik reverse proxy configuration, allowing at attacker to access administrative endpoints. The internal Actuator endpoint can be leveraged for access to heap dumps and trace logs.This issue is known to affect Concerto from 12.1.2 through 12.2.0. Additional versions may be vulnerable.

Affected products

• Versa-Networks Concerto: from 11.4.0, before 12.1.2 (fixed in 12.1.2); version 12.1.2 only; version 12.2.0 only

Published 2025-05-21. Last modified 2026-06-17.