CVE-2025-34026

Description

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.

Overview

State: PUBLISHED
Assigner (CNA): VulnCheck
CVSS severity: CRITICAL
CVSS score: 9.2 / 10
CVSS vector: 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
Effective score: 9.2 / 10 CRITICAL source: CNA overview
CWE(s): CWE-288
Reserved: 2025-04-15
Published: 2025-05-21 22:04 UTC
Last updated: 2026-01-23 14:34 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2025/34xxx/CVE-2025-34026.json
Linked Threat: CVE-2025-34026 — Versa Concerto: Versa Concerto Improper Authentication Vulnerability

CISA Known Exploited Vulnerabilities CISA KEV

CISA has confirmed in-the-wild exploitation of this CVE. Federal agencies must remediate by the due date below; private orgs should treat it as priority-1.

Vulnerability name: Versa Concerto Improper Authentication Vulnerability
Vendor / project: Versa
Product: Concerto
Date added to KEV: 2026-01-22
Remediation due: 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.
Ransomware campaign use: Unknown
CISA notes: https://security-portal.versa-networks.com/emailbulletins/6830f94328defa375486ff2e ; https://nvd.nist.gov/vuln/detail/CVE-2025-34026
CISA listing: www.cisa.gov/known-exploited-vulnerabilities-catalog

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2025-05-21 22:15:50 UTC
NVD last modified: 2026-01-23 18:39:24 UTC
NVD CVSS v3.1: 7.5 / 10 HIGH source: nvd@nist.gov
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Exploitability subscore: 3.9 / 10
Impact subscore: 3.6 / 10
EPSS score: 0.7108 (probability of exploitation in next 30 days)
EPSS percentile: 98.73% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2025-16087
Assigner: VulnCheck
Published: May 21, 2025, 10:04:58 PM
Updated: Jan 23, 2026, 2:34:06 PM
EUVD base score (CVSS 4.0): 9.2 / 10
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
EUVD-reported EPSS: 71.0800
Vendors: Versa
Products: Concerto (12.1.2 ≤12.2.0)
Aliases: GHSA-h2mm-jj4p-hm2p

ENISA description: 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.

EUVD references (1)

https://projectdiscovery.io/blog/versa-concerto-authentication-bypass-rce

Affected products (1)

Vendor	Product	Versions	Platforms
Versa	Concerto	`12.1.2` (affected)	—

Affected products — CPE 2.3 (3) NVD

NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.

cpe:2.3:a:versa-networks:concerto:*:*:*:*:*:*:*:*
cpe:2.3:a:versa-networks:concerto:12.1.2:-:*:*:*:*:*:*
cpe:2.3:a:versa-networks:concerto:12.2.0:*:*:*:*:*:*:*

Vendor references (1)

References embedded in the original CVE record by the assigning CNA.

https://projectdiscovery.io/blog/versa-concerto-authentication-bypass-rce exploitmitigation

Web references (4)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

http://cwe.mitre.org/data/definitions/288.html rapid7:cwe.mitre.org
https://attackerkb.com/topics/CVE-2025-34026 rapid7:attackerkb.com
https://projectdiscovery.io/blog/versa-concerto-authentication-bypass-rce rapid7:projectdiscovery.io
https://www.cve.org/CVERecord?id=CVE-2025-34026 rapid7:www.cve.org

NVD-tagged references (4)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://projectdiscovery.io/blog/versa-concerto-authentication-bypass-rce disclosure@vulncheck.com ExploitMitigationThird Party Advisory
https://projectdiscovery.io/blog/versa-concerto-authentication-bypass-rce 134c704f-9b21-4f2e-91b3-4a467353bcc0 ExploitMitigationThird Party Advisory
https://security-portal.versa-networks.com/emailbulletins/6830f94328defa375486ff2e 134c704f-9b21-4f2e-91b3-4a467353bcc0 Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-34026 134c704f-9b21-4f2e-91b3-4a467353bcc0 US Government Resource

Indicators (2)

IOCs linked to the auto-promoted Threat row.

Type	Value	VirusTotal	Attached
cwe	`CWE-288`	no local data	2026-05-14 02:58 UTC
cve	`CVE-2025-34026`	no local data	2026-05-14 02:58 UTC

Remediations (9)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

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.NET and .NET Framework May 2026 servicing releases updates

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2026-05-14 18:50 UTC
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web:portal.msrc.microsoft.com

The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.

2026-05-14 18:50 UTC
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web:www.malwarebytes.com

May's Patch Tuesday may not be the giant release many expected, but there are still plenty of important fixes that shouldn't be ignored.

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The second Tuesday of May 2026 marked another major security update release from Microsoft, addressing a broad range of vulnerabilities across Windows, Microsoft Office, SharePoint, Dynamics 365, .NET, DNS Client, and other core enterprise components. While this month's Patch Tuesday did not include any actively exploited or publicly disclosed zero-day vulnerabilities, the release still ...

2026-05-14 18:50 UTC
CISA Required Action

CISA KEV

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Due date: 2026-02-12 Known ransomware campaign use: Unknown

2026-05-14 01:13 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2025-34026.json.

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