What is CVE-2025-34026?

CVE-2025-34026 is a high-severity vulnerability in Versa Concerto, classified under Authentication Bypass Using an Alternate Path or Channel. CVSS score: 7.5/10. Published 2025-05-21.

How severe is CVE-2025-34026?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2025-34026 known to be exploited?

Yes. CVE-2025-34026 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-01-22), indicating it is being actively exploited. 1 public proof-of-concept repositories are indexed.

Vulnerability in Versa Concerto

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.

Published 2025-05-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.818 (99.6th percentile), scored 2026-10-18.

High probability of exploitation in the next 30 days — patch promptly. 100th percentile — 99.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.819 · newest: 0.818 · change: -0.002

Affected products

Versa Concerto — versions 12.1.2
Versa-Networks Concerto — versions 12.1.2, 12.2.0

Weakness classification (CWE)

CWE-288 — Authentication Bypass Using an Alternate Path or Channel

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2026-01-22. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2026-02-12.

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.

Public proof-of-concept exploits

ARPSyndicate/cve-scores

References

projectdiscovery.io/blog/versa-concerto-authentication-bypass-rce (Exploit, Third Party Advisory, exploit, Mitigation, mitigation)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (Vendor Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2025-34026?: CVE-2025-34026 is a high-severity vulnerability in Versa Concerto, classified under Authentication Bypass Using an Alternate Path or Channel. CVSS score: 7.5/10. Published 2025-05-21.
How severe is CVE-2025-34026?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2025-34026 known to be exploited?: Yes. CVE-2025-34026 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-01-22), indicating it is being actively exploited. 1 public proof-of-concept repositories are indexed.