Concerto - Authentication Bypass (CVE-2025-34026)

CVE-2025-34026 is a critical vulnerability impacting the Versa Concerto SD-WAN orchestration platform, resulting from an authentication bypass in the reverse proxy configuration. This flaw enables attackers to access sensitive administrative endpoints, potentially exposing heap dumps and trace logs via the internal Actuator interface.

CrowdSec has been tracking this vulnerability and its exploits since 28th of May 2025.

CrowdSec network observations suggest that most exploitation of CVE-2025-34026 involves focused reconnaissance to identify viable targets. Attackers typically tailor their campaigns based on system exposure and configuration. It is unlikely that a given attack is accidental. CrowdSec network telemetry also shows that exploitation of CVE-2025-34026 has significantly declined over the past week. Attack volumes are well below the long-term average, suggesting attackers are rapidly losing interest. The vulnerability appears to be falling out of active use across most threat landscapes.

Observed exploitation attempts often target URLs containing /portalapi/actuator.