CVE-2025-34026
Versa Concerto Improper Authentication Vulnerability
Versa Concerto
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.
Exploitation status
CISA Known Exploited Vulnerabilities
Listed by CISA on 22 January 2026. US federal agencies were required to remediate it by 12 February 2026.
EPSS — exploitation probability
FIRST puts the probability of exploitation activity in the next 30 days at 81.9%, which is higher than 99.6% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Frequently asked questions
Is CVE-2025-34026 being exploited by ransomware groups?
No ransomware group in this database is currently recorded as exploiting CVE-2025-34026.
What does CVE-2025-34026 affect?
CVE-2025-34026 affects Versa Concerto. 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.
How severe is CVE-2025-34026?
CVE-2025-34026 is rated HIGH with a CVSS base score of 7.5. EPSS puts the probability of exploitation in the next 30 days at 81.9%, higher than 99.6% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 12 February 2026.
How should organisations respond to CVE-2025-34026?
Apply the vendor patch for Versa Concerto as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.