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1 vulnerability by Rakuten Viber

CVE-2025-13476 (GCVE-0-2025-13476)

Vulnerability from cvelistv5 – Published: 2026-03-05 16:53 – Updated: 2026-03-06 10:36
VLAI?
Title
Rakuten Viber uses broken or risky cryptographic Algorithm
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)
Severity ?
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Rakuten Viber Rakuten Viber Cloak - Android Affected: 25.7.2.0g , < 27.2.0.0g (custom)
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{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-03-05T18:35:24.559Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "cvssV3_1": {
              "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"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2025-13476",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-06T10:34:45.858741Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-03-06T10:36:09.154Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Rakuten Viber Cloak - Android",
          "vendor": "Rakuten Viber",
          "versions": [
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              "lessThan": "27.2.0.0g",
              "status": "affected",
              "version": "25.7.2.0g",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "Rakuten Viber Cloak - Windows",
          "vendor": "Rakuten Viber",
          "versions": [
            {
              "lessThan": "v27.3.0.0",
              "status": "affected",
              "version": "v25.6.0.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "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)"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-327 Use of a Broken or Risky Cryptographic Algorithm",
              "lang": "en"
            }
          ]
        },
        {
          "descriptions": [
            {
              "description": "CWE-693",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-05T16:53:32.465Z",
        "orgId": "37e5125f-f79b-445b-8fad-9564f167944b",
        "shortName": "certcc"
      },
      "references": [
        {
          "url": "https://www.viber.com/en/download/"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Rakuten Viber uses broken or risky cryptographic Algorithm",
      "x_generator": {
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        "env": "prod",
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  "cveMetadata": {
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    "assignerShortName": "certcc",
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    "datePublished": "2026-03-05T16:53:32.465Z",
    "dateReserved": "2025-11-20T12:38:19.605Z",
    "dateUpdated": "2026-03-06T10:36:09.154Z",
    "state": "PUBLISHED"
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