CVE-2025-34026: Versa Concerto exploited

Advisory generated from the CVE record, CISA, Exploit Observer and VEDAS: what it is, whether it is exploited, who is affected, and how to fix and detect 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.

Description quoted from the CVE record (assigned by VulnCheck, published 2025-05-21).

Weakness: CWE-288 Authentication Bypass Using an Alternate Path or Channel

How it can be exploited

Exploitable over the network with low attack complexity with no special attack requirements needing no privileges and no user interaction. Impact: confidentiality high, integrity none, availability none. 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

CISA assessment (SSVC): CISA assesses exploitation as active. Automatable: yes. Technical impact: partial.

On CISA KEV since: 2026-01-22
US federal deadline: 2026-02-12
Ransomware use: Not known

Public exploit evidence (Exploit Observer)

Also known as: BDU:2025-06722, CNNVD-202505-3245, EUVD-2025-16087, GHSA-h2mm-jj4p-hm2p

VEDAS cluster: VEDAS:FLOCKINGFALCON

Exploit Observer links 6 pieces of public exploit code or detection modules that name this CVE or one of its aliases.

Exploit code and modules (6)

Code that names this CVE. A repository can be a working exploit, a scanner, a fake or malware; read it before running anything.

Vulnerability databases and vendor advisories (6)

Catalogue entries, not exploit evidence.

Vulnerability database or vendor advisory: https://euvd.enisa.europa.eu/enisa/EUVD-2025-16087
Vulnerability database or vendor advisory: https://github.com/advisories/GHSA-h2mm-jj4p-hm2p
Vulnerability database or vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2025-34026
Vulnerability database or vendor advisory: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-34026
Vulnerability database or vendor advisory: https://www.cnnvd.org.cn/home/globalSearch?keyword=CNNVD-202505-3245
Vulnerability database or vendor advisory: https://www.tenable.com/cve/CVE-2025-34026

13 more references returned by Exploit Observer did not name this CVE or an alias, so they are left out.

VEDAS data as of 2026-11-01T17:12 UTC; fetched 2026-11-02.

Live scores

EPSS: 0.818
very likely to be attacked soon
VEDAS: 0.978
strong exploit evidence
On CISA KEV: Yes, since 2026-01-22
Detection rule: Nuclei · Suricata

EPSS (chance of attack)

VEDAS (exploit evidence)

Thin horizontal line: the “likely” (EPSS 0.10) or “strong” (VEDAS 0.90) threshold. Shaded “no data” areas are periods when cve-scores did not publish. The vertical line is the day CISA added it to its exploited list.

VEDAS flagged this bug about 158 days before CISA confirmed attacks.

Who is affected

Product	Affected	Not affected
Versa Concerto	from 12.1.2 up to and including 12.2.0	Not stated

Version ranges exactly as the CVE record states them. “Before X” means X is the first fixed version.

Exploit Observer also maps it to: versa-networks concerto, versa_networks concerto.

How to fix it

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.

Vendor guidance:

https://projectdiscovery.io/blog/versa-concerto-authentication-bypass-rce (exploit, mitigation)
https://security-portal.versa-networks.com/emailbulletins/6830f94328defa375486ff2e (vendor-advisory)

How to detect it

Nuclei template (active check)

Versa - Authentication Bypass
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.

Name and description quoted from the template, written by VEDAS.

The template sends 1 request (GET /portalapi/actuator); it decides using word matchers. Severity in the template: critical. Marked as not yet verified against a live vulnerable target.

Run it against a host you own or are authorised to test:

bash

nuclei -u https://your-host -t CVE-2025-34026.yaml

Show the template (40 lines)

yaml

id: CVE-2025-34026

info:
  name: "Versa - Authentication Bypass"
  author: vedas-arpsyndicate
  severity: critical
  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.
  reference:
    - https://www.exploit.observer/?keyword=CVE-2025-34026&match=exact
    - https://subdomain.center/?engine=ammonites&keyword=versa&match=exact
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
    cvss-score: 7.5
    cve-id: CVE-2025-34026
    cwe-id: CWE-288
  metadata:
    verified: false
  tags: versa,concerto,actuator,auth-bypass,springboot,cve,cve2025,vkev,vuln,kev
http:
  - raw:
      - |
        GET /portalapi/actuator HTTP/1.1
        Host: {{Hostname}}
        Connection: X-Real-Ip

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - heapdump

      - type: word
        part: header
        words:
          - EECP-CSRF-TOKEN

CVE-2025-34026.yaml on GitHub

Suricata rules (network detection)

1 rule that alert on traffic matching this exploit: VEDAS CVE-2025-34026 Versa - Authentication Bypass. Add them to your Suricata rule set and reload.

Show the rules

suricata

alert http $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS (msg:"VEDAS CVE-2025-34026 Versa - Authentication Bypass"; flow:established,to_server; http.uri; content:"/portalapi/actuator"; nocase; fast_pattern; classtype:web-application-attack; reference:cve,CVE-2025-34026; reference:url,https://www.exploit.observer/?keyword=CVE-2025-34026&match=exact; reference:url,https://subdomain.center/?engine=ammonites&keyword=versa&match=exact; sid:1009010; rev:1;)

CVE-2025-34026.rules on GitHub

References

Vendor advisories and patches

https://projectdiscovery.io/blog/versa-concerto-authentication-bypass-rce (exploit, mitigation)
https://security-portal.versa-networks.com/emailbulletins/6830f94328defa375486ff2e (vendor-advisory)

Government sources

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-34026 (government-resource)

Other databases

Where this comes from

This advisory is generated automatically by VEDAS from: CVE.org record, CISA KEV, cve-scores (EPSS and VEDAS), Exploit Observer, vedas-signatures. Text in quotes is reproduced from the source; everything else is a fixed template filled with source fields. Nothing here is written by a language model. Check the vendor advisory before acting, and read how VEDAS and Exploit Observer work, and their limits.