---
title: "CVE-2025-34026: Versa Concerto Improper Authentication Vulnerability"
url: https://erroneo.us/security/cve/CVE-2025-34026/
description: "CVE-2025-34026 (Versa Concerto): Exploited in the wild (CISA KEV). The Versa Concerto SD-WAN orchestration platform is vulnerable to an authentication…"
type: vulnerability-record
section: "Security Digest"
date_published: 2025-05-21
date_modified: 2026-01-23
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2025-34026"
kev: true
cvss: 9.2
epss: 0.8178
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2025-34026: Versa Concerto Improper Authentication Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Versa Concerto. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-01-22, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-02-12 ; treat that as the outer limit, not the target.
- EPSS 81.8% , percentile 99.6: FIRST’s model estimates a 81.8% chance of exploitation activity in the next 30 days, higher than 99.6% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.

## What it is

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.

## Affected products (CVE record)

- Versa Concerto: 12.1.2 <= 12.2.0

## Severity

- VulnCheck CVSS 4.0: 9.2 `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`

## Exploitation

- CISA KEV: added 2026-01-22; federal due date 2026-02-12. Known ransomware use: Unknown.
- 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.
- CISA SSVC assessment: exploitation active , automatable yes , technical impact partial .
- FIRST EPSS (model of 2026-10-21): 81.78% probability of exploitation activity in the next 30 days; percentile 99.6.

## Sources

- [projectdiscovery.io](https://projectdiscovery.io/blog/versa-concerto-authentication-bypass-rce)
- [security-portal.versa-networks.com](https://security-portal.versa-networks.com/emailbulletins/6830f94328defa375486ff2e)
- [CVE.org record CVE-2025-34026](https://www.cve.org/CVERecord?id=CVE-2025-34026)
- [NVD entry CVE-2025-34026](https://nvd.nist.gov/vuln/detail/CVE-2025-34026)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-34026)

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Source page: https://erroneo.us/security/cve/CVE-2025-34026/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt