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Actively exploited in the wild. This CVE is on the CISA Known Exploited Vulnerabilities list — treat remediation as urgent. Federal remediation due by 12 Feb 2026.
ConcertoApplication · Versa Networks

CVE-2025-34026

HIGH · 7.5 CVSS v3.1 Published 2025-05-21
Fix available
A fix is available. Upgrade to 12.1.2 or later.
See remediation →
100/100
Remediation priority · Urgent
In the wild High EPSS Public exploit Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
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.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

Authentication bypass vulnerability in the Traefik reverse proxy configuration of Versa Concerto SD-WAN orchestration platform allows attackers to bypass authentication and access administrative endpoints. The internal Actuator endpoint can be exploited to obtain sensitive information including heap dumps and trace logs.

MitigationUpdate to a patched version of Concerto when available. Until then, restrict access to the Traefik reverse proxy and disable or firewall the Actuator endpoints to prevent unauthenticated access.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
ConcertoApplication
Affected:>= 11.4.0, < 12.1.2= 12.1.2= 12.2.0

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify Versa Concerto installed version
    Check the installed package version via the system management interface or by querying the Concerto software version (e.g., via 'show version' CLI command or system information page)
    Affected if The installed version falls within 11.4.0 to 12.2.0 inclusive (specifically >= 11.4.0 and < 12.1.2, or equals 12.1.2, or equals 12.2.0)
  2. Locate Traefik reverse proxy configuration
    Inspect the Traefik configuration files or service settings for Concerto SD-WAN deployments; check if Traefik is deployed as the reverse proxy component
    Affected if Traefik is configured and exposed as the entry point for HTTP/HTTPS traffic
  3. Verify Spring Actuator endpoint exposure
    Attempt to access common Spring Actuator paths such as /actuator/health, /actuator/heapdump, /actuator/trace, or /actuator/env via HTTP requests to the exposed Traefik interface
    Affected if Spring Actuator endpoints are accessible without authentication on the Traefik-exposed interface
  4. Confirm administrative endpoint accessibility
    Test whether administrative interfaces (such as /admin, /api/admin, or Concerto management endpoints) are reachable through the Traefik reverse proxy without providing credentials
    Affected if Administrative endpoints can be accessed without authentication

A system is affected if it runs a Versa Concerto version between 11.4.0 and 12.2.0 and has Traefik with exposed Spring Actuator endpoints that allow unauthenticated access to administrative functions or sensitive data like heap dumps and trace logs.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 12.1.2 or later
Fixed in 12.1.2
Interim mitigation

Update to a patched version of Concerto when available. Until then, restrict access to the Traefik reverse proxy and disable or firewall the Actuator endpoints to prevent unauthenticated access.

Recommended fix Moderate confidence

Versa Concerto 12.2.1 or later (contact vendor for exact fixed version)

  1. Contact Versa Networks support to obtain the security patch or fixed release for this authentication bypass vulnerability
  2. Review Versa Concerto release notes or security advisory for version 12.2.1 or later that addresses CVE-2025-34026
  3. Plan upgrade during maintenance window following standard backup procedures
  4. After upgrade, verify that Traefik reverse proxy configuration properly enforces authentication on administrative endpoints
  5. Confirm Actuator endpoints are no longer exposed without authentication
Caveat Upgrade should follow standard Concerto update procedures; test in non-production environment first

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Concerto Exploited in the wild — priority engagement
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA4.0 h
22.0 hours of engineering $3,860
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-34026 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data