9.0criticalCritical
CVE-2025-34027
Versa-Networks 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 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.
Exploitation status
- Published references include exploit or proof-of-concept material. There is no confirmation it is being used in real attacks.
What the metrics mean
- It is reachable over a network, without needing local access.
- For an attacker who can reach it, exploitation depends on conditions outside the attacker's control.
- To exploit it, no account is needed.
- Beyond that, no action by a user is required.
Scoring
- CVSS
- 9.0 (v3.1)
- Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H- CVSS v4
- 10.0
- Weakness
- CWE-367
- Assigned by
- disclosure@vulncheck.com
Dates
- Published
- 2025-05-21
- Last modified
- 2026-08-25
- Sources
- NVD
Affected products
- Versa-Networks Concerto11.4.0 - 12.1.1, 12.1.2, 12.2.1
As listed in the NVD configuration data. Not a statement about your estate.