CVE-2025-34027

critical

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 Spack upload endpoint can be leveraged for a Time-of-Check to Time-of-Use (TOCTOU) write in combination with a race condition to achieve remote code execution via path loading manipulation, allowing an unauthenticated actor to achieve remote code execution (RCE).This issue is known to affect Concerto from 12.1.2 through 12.2.0. Additional versions may be vulnerable.

https://projectdiscovery.io/blog/versa-concerto-authentication-bypass-rce

https://www.infosecurity-magazine.com/news/critical-zerodays-versa-networks/

https://www.bleepingcomputer.com/news/security/unpatched-critical-bugs-in-versa-concerto-lead-to-auth-bypass-rce/

https://thehackernews.com/2025/05/unpatched-versa-concerto-flaws-let.html

Details

Source: Mitre, NVD

Published: 2025-05-21

Updated: 2025-05-23

Risk Information

CVSS v2

Base Score: 7.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

Severity: High

CVSS v3

Base Score: 9.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical

CVSS v4

Base Score: 10

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L

Severity: Critical

EPSS

EPSS: 0.0021

Vulnerability Watch

Tenable Research has classified this CVE under the following Vulnerability Watch classification, which includes active and historical (inactive) classifications. You can learn more about these classifications on our blog.

Vulnerability Being Monitored

Detections

Analytics