CVE-2025-52494

{
  "id": "CVE-2025-52494",
  "sourceIdentifier": "[email protected]",
  "published": "2025-09-03T18:15:35.120",
  "lastModified": "2026-11-07T18:10:00.200",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Adacore Ada Web Server (AWS) before 25.2 is vulnerable to a denial-of-service (DoS) condition due to improper handling of SSL handshakes during connection initialization. When a client initiates an HTTPS connection, the server performs the SSL handshake before assigning the connection to a processing slot. However, there is no specific timeout set for this phase, and the server uses the default socket timeout, which is effectively infinite. An attacker can exploit this by sending a malformed TLS ClientHello message with incorrect length values. This causes the server to wait indefinitely for data that never arrives, blocking the worker thread (Line) handling the connection. By opening multiple such connections, up to the server's maximum limit, the attacker can exhaust all available working threads, preventing the server from handling new, legitimate requests."
    },
    {
      "lang": "es",
      "value": "Adacore Ada Web Server (AWS) antes de 25.2 es vulnerable a una condición de denegación de servicio (DoS) debido a un manejo inadecuado de los handshakes SSL durante la inicialización de la conexión. Cuando un cliente inicia una conexión HTTPS, el servidor realiza el handshake SSL antes de asignar la conexión a un slot de procesamiento. Sin embargo, no hay un tiempo de espera (timeout) específico configurado para esta fase, y el servidor utiliza el tiempo de espera (timeout) de socket predeterminado, que es efectivamente infinito. Un atacante puede explotar esto enviando un mensaje TLS ClientHello malformado con valores de longitud incorrectos. Esto hace que el servidor espere indefinidamente por datos que nunca llegan, bloqueando el hilo de trabajo (Line) que maneja la conexión. Al abrir múltiples conexiones de este tipo, hasta el límite máximo del servidor, el atacante puede agotar todos los hilos de trabajo disponibles, impidiendo que el servidor maneje nuevas solicitudes legítimas."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "version": "n/a",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2025-09-03T17:52:39.527064Z",
          "id": "CVE-2025-52494",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-400"
        },
        {
          "lang": "en",
          "value": "CWE-770"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:adacore:ada_web_server:*:*:*:*:*:*:*:*",
              "versionEndExcluding": "26.0",
              "matchCriteriaId": "423A6212-3351-4936-A734-62A46CD4850D"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://adacore.com",
      "source": "[email protected]",
      "tags": [
        "Product"
      ]
    },
    {
      "url": "https://docs.adacore.com/corp/security-advisories/SEC.AWS-0095-v1.pdf",
      "source": "[email protected]",
      "tags": [
        "Technical Description",
        "Vendor Advisory"
      ]
    }
  ]
}