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CVE-2025-34026

Versa — Versa Concerto Improper Authentication Vulnerability

Versa · CWE-288 · in CISA KEV since 2026-01-22

CISA federal deadline · Overdue by 8 monthsCISA KEVActively Exploited
84

EVRS 84 of 100 Urgent

Patch This Cycle

Rank 496 of 2,960 tracked

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Why it scores 84

Evidence available: 6 of 7 signals

Listed in the CISA KEV catalog, and an EPSS probability of 0.818.

  • CISA KEVApplied
  • RansomwareDid not apply
  • Vendor exploitationDid not apply
  • EPSSApplied
  • Microsoft Exploitability IndexNot applicable
  • Pre-patch disclosureNo data
  • KEV recencyDid not apply
  • CVSSApplied

The band answers “how soon”, not “how bad”. No data for: Pre-patch disclosure. Why some signals show no data

Fix

Patch or fixed version identified

CISA required action

Fixed in

concerto: update to 12.1.2 or later

Affected versions

  • concerto>= 11.4.0 < 12.1.212.1.212.2.0

Remediation

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Fixed versions from NVD.

Evidence

Each value with its source
MeasureValueSource
CVSS base scoreHow severe the flaw is in itself. It does not say how likely an attack is. 9.2 NVD
FIRST EPSSFIRST's estimate of the chance this is exploited in the next 30 days, and how that ranks against all CVEs. 0.818 (99.65th pctl) FIRST EPSS
Actively exploitedWhether a source of record has confirmed attacks using it in the wild. Confirmed CISA KEV
Ransomware campaign useWhether CISA has seen ransomware operators use it. Unknown or none CISA KEV
CISA remediation deadlineThe date US federal agencies must have fixed or mitigated it. 2026-02-12 · CISA federal deadline · Overdue by 8 months CISA KEV
Public exploit moduleA module existing is not the same as active exploitation. None known Metasploit
EUVD cross-referenceENISA's record: CVSS 9.2 (v4.0), assigned by VulnCheck. Listed ENISA EUVD

Description

NVD

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.

What CISA says to do