FKIE_CVE-2025-13476

Vulnerability from fkie_nvd - Published: 2026-03-05 19:15 - Updated: 2026-03-10 19:49
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
Rakuten Viber Cloak mode in Android v25.7.2.0g and Windows v25.6.0.0–v25.8.1.0 uses a static and predictable TLS ClientHello fingerprint lacking extension diversity, allowing Deep Packet Inspection (DPI) systems to trivially identify and block proxy traffic, undermining censorship circumvention. (CWE-327)
References
cret@cert.orghttps://www.viber.com/en/download/Product
af854a3a-2127-422b-91ae-364da2661108https://www.kb.cert.org/vuls/id/772695Third Party Advisory
Impacted products
Vendor Product Version
rakuten viber *
rakuten viber 9.3.0.6
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:rakuten:viber:*:*:*:*:*:windows:*:*",
              "matchCriteriaId": "F75AF4DA-3BBA-44F1-80FA-6FF49AB18C20",
              "versionEndIncluding": "25.8.1.0",
              "versionStartIncluding": "25.6.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:rakuten:viber:9.3.0.6:25.7.2.0g:*:*:*:android:*:*",
              "matchCriteriaId": "758AEEB0-8E18-48D2-A8A5-662BAAE54CFF",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Rakuten Viber Cloak mode in Android v25.7.2.0g and Windows v25.6.0.0\u2013v25.8.1.0 uses a static and predictable TLS ClientHello fingerprint lacking extension diversity, allowing Deep Packet Inspection (DPI) systems to trivially identify and block proxy traffic, undermining censorship circumvention. (CWE-327)"
    },
    {
      "lang": "es",
      "value": "El modo Cloak de Rakuten Viber en Android v25.7.2.0g y Windows v25.6.0.0\u2013v25.8.1.0 utiliza una huella digital TLS ClientHello est\u00e1tica y predecible que carece de diversidad de extensiones, lo que permite a los sistemas de Inspecci\u00f3n Profunda de Paquetes (DPI) identificar y bloquear trivialmente el tr\u00e1fico de proxy, socavando la elusi\u00f3n de la censura. (CWE-327)"
    }
  ],
  "id": "CVE-2025-13476",
  "lastModified": "2026-03-10T19:49:55.930",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-03-05T19:15:58.283",
  "references": [
    {
      "source": "cret@cert.org",
      "tags": [
        "Product"
      ],
      "url": "https://www.viber.com/en/download/"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://www.kb.cert.org/vuls/id/772695"
    }
  ],
  "sourceIdentifier": "cret@cert.org",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-327"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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