cve-2025-34027

{
  "cvss": 10.0,
  "datePublished": "2025-05-21T22:15:50.680",
  "dateUpdated": "2026-08-25T15:04:33.830",
  "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 Spack upload endpoint can be leveraged for a Time-of-Check to Time-of-Use (TOCTOU) write in combination with a race condition to achieve remote code execution via path loading manipulation, allowing an unauthenticated actor to achieve remote code execution (RCE).This issue is known to affect Concerto from 12.1.2 through 12.2.0. Additional versions may be vulnerable.",
  "id": "CVE-2025-34027",
  "raw": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unknown",
            "modules": [
              "Traefik"
            ],
            "product": "Concerto",
            "vendor": "Versa",
            "versions": [
              {
                "lessThanOrEqual": "12.2.0",
                "status": "affected",
                "version": "12.1.2",
                "versionType": "semver"
              }
            ]
          }
        ],
        "source": "disclosure@vulncheck.com"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
                "criteria": "cpe:2.3:a:versa-networks:concerto:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "11BE2F99-F06A-4EA2-A033-B294EADCC025",
                "versionEndIncluding": "12.1.1",
                "versionStartIncluding": "11.4.0",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:versa-networks:concerto:12.1.2:-:*:*:*:*:*:*",
                "matchCriteriaId": "BC56E615-FC18-48FF-B52E-2251B45A6B43",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:versa-networks:concerto:12.2.1:-:*:*:*:*:*:*",
                "matchCriteriaId": "E6E76412-5BC5-4E72-9948-4BB5558D55F4",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "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 Spack upload endpoint can be leveraged for a Time-of-Check to Time-of-Use (TOCTOU) write in combination with a race condition to achieve remote code execution via path loading manipulation, allowing an unauthenticated actor to achieve remote code execution (RCE).This issue is known to affect Concerto from 12.1.2 through 12.2.0. Additional versions may be vulnerable."
      },
      {
        "lang": "es",
        "value": "La plataforma de orquestación SD-WAN Versa Concerto es vulnerable a una omisión de autenticación en la configuración del proxy inverso Traefik, lo que permite a un atacante acceder a los endpoints administrativos. El endpoint de carga de Spack puede aprovecharse para una escritura TOCTOU (Tiempo de Verificación a Tiempo de Uso) en combinación con una condición de ejecución para lograr la ejecución remota de código mediante la manipulación de la carga de rutas, lo que permite que un agente no autenticado logre la ejecución remota de código (RCE). Se sabe que este problema afecta a Concerto desde la versión 12.1.2 hasta la 12.2.0. Otras versiones podrían ser vulnerables."
      }
    ],
    "id": "CVE-2025-34027",
    "lastModified": "2026-08-25T15:04:33.830",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.0,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.2,
          "impactScore": 6.0,
          "source": "nvd@nist.gov",
          "type": "Primary"
        }
      ],
      "cvssMetricV40": [
        {
          "cvssData": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "availabilityRequirement": "NOT_DEFINED",
            "baseScore": 10.0,
            "baseSeverity": "CRITICAL",
            "confidentialityRequirement": "NOT_DEFINED",
            "exploitMaturity": "NOT_DEFINED",
            "integrityRequirement": "NOT_DEFINED",
            "modifiedAttackComplexity": "NOT_DEFINED",
            "modifiedAttackRequirements": "NOT_DEFINED",
            "modifiedAttackVector": "NOT_DEFINED",
            "modifiedPrivilegesRequired": "NOT_DEFINED",
            "modifiedSubAvailabilityImpact": "NOT_DEFINED",
            "modifiedSubConfidentialityImpact": "NOT_DEFINED",
            "modifiedSubIntegrityImpact": "NOT_DEFINED",
            "modifiedUserInteraction": "NOT_DEFINED",
            "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
            "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
            "modifiedVulnIntegrityImpact": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "LOW",
            "subConfidentialityImpact": "HIGH",
            "subIntegrityImpact": "HIGH",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
            "version": "4.0",
            "vulnAvailabilityImpact": "LOW",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "source": "disclosure@vulncheck.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2025-34027",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "yes"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2025-05-28T03:56:05.405556Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2025-05-21T22:15:50.680",
    "references": [
      {
        "source": "disclosure@vulncheck.com",
        "tags": [
          "Exploit",
          "Third Party Advisory"
        ],
        "url": "https://projectdiscovery.io/blog/versa-concerto-authentication-bypass-rce"
      },
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "tags": [
          "Exploit",
          "Third Party Advisory"
        ],
        "url": "https://projectdiscovery.io/blog/versa-concerto-authentication-bypass-rce"
      }
    ],
    "sourceIdentifier": "disclosure@vulncheck.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-367"
          }
        ],
        "source": "disclosure@vulncheck.com",
        "type": "Secondary"
      }
    ]
  },
  "severity": "CRITICAL",
  "source": "nvd",
  "title": "The Versa Concerto SD-WAN orchestration platform is vulnerable to an authentication bypass in the Traefik reverse pro..."
}