Actively exploited · Published May 21, 2025 · Assigned by VulnCheck
CVE-2025-34026Versa Concerto Actuator Authentication Bypass Information Leak
Critical 9.2 Exploited
In plain English
A critical-severity authentication bypass in Concerto from Versa. Attackers are actively exploiting it in the wild (listed by CISA on January 22, 2026). The chance it is exploited in the next 30 days is estimated at 81.8% (higher than 99.6% of all known vulnerabilities). Ready-made attack tooling exists: Nuclei. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CISA guidance
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Federal agencies must remediate by Feb 12, 2026.
Official description
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 (as reported)
Weakness: CWE-288 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:L/SA:N