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.
9.2
83.2%
Vector breakdown
- Attack vector
- Network
- Attack complexity
- Low
- Attack requirements
- None
- Privileges required
- None
- User interaction
- None
- Confidentiality (Vulnerable System)
- High
- Integrity (Vulnerable System)
- None
- Availability (Vulnerable System)
- None
- Confidentiality (Subsequent System)
- High
- Integrity (Subsequent System)
- Low
- Availability (Subsequent System)
- None
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
- Published
- May 21, 2025
- Modified
- Jan 23, 2026
- Added to KEV
- Jan 22, 2026
- Federal patch due
- Feb 12, 2026
CISA required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Weakness classification
Proof-of-concept & exploitation references
Weaponization
Public repositories whose name or description references CVE-2025-34026, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit - cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.
No public GitHub repositories referencing CVE-2025-34026 were found at last check. Absence here is not proof no exploit exists - see the references below for vendor advisories and write-ups.
References
Frequently asked questions
What is CVE-2025-34026?
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 has a CVSS base score of 9.2 out of 10 (CVSS 4.0).
Is CVE-2025-34026 actively exploited in the wild?
Yes. CVE-2025-34026 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added Jan 22, 2026, meaning CISA has confirmed evidence of active exploitation.
What is the EPSS score for CVE-2025-34026?
83.2% - meaning FIRST.org's EPSS model estimates a 83.2% probability this vulnerability will be exploited in the wild within 30 days (100% percentile among all scored CVEs).
Is there exploit tooling available for CVE-2025-34026?
Yes - a public Nuclei template referencing CVE-2025-34026 exist in public repositories we checked.
What type of vulnerability is CVE-2025-34026?
CVE-2025-34026 is classified under CWE-288 (CWE-288 Authentication Bypass Using an Alternate Path or Channel).
Cross-checked against
Impactr finds and proves whether CVE-2025-34026 - or flaws like it - are actually reachable in your own web apps and APIs, with a reproducible exploit as evidence.
Join the waitlist