{"id":"CVE-2025-13476","state":"PUBLISHED","title":"Rakuten Viber uses broken or risky cryptographic Algorithm","description":"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)","publishedAt":"2026-03-05T16:53:32.465Z","updatedAt":"2026-03-06T10:36:09.154Z","severity":{"score":9.8,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"CISA-ADP"},"assigner":"certcc","products":["Rakuten Viber Rakuten Viber Cloak - Android","Rakuten Viber Rakuten Viber Cloak - Windows"],"affected":[{"vendor":"Rakuten Viber","product":"Rakuten Viber Cloak - Android","versions":[{"version":"25.7.2.0g","status":"affected","lessThan":"27.2.0.0g","versionType":"custom"}]},{"vendor":"Rakuten Viber","product":"Rakuten Viber Cloak - Windows","versions":[{"version":"v25.6.0.0","status":"affected","lessThan":"v27.3.0.0","versionType":"custom"}]}],"references":["https://www.viber.com/en/download/","https://www.kb.cert.org/vuls/id/772695"],"weaknesses":[],"ingestedAt":"2026-10-29T20:08:31.050Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/13xxx/CVE-2025-13476.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-13476","state":"PUBLISHED","datePublished":"2026-03-05T16:53:32.465Z","dateUpdated":"2026-03-06T10:36:09.154Z","assignerShortName":"certcc","assignerOrgId":"37e5125f-f79b-445b-8fad-9564f167944b","dateReserved":"2025-11-20T12:38:19.605Z"},"containers":{"cna":{"title":"Rakuten Viber uses broken or risky cryptographic Algorithm","descriptions":[{"lang":"en","value":"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)"}],"affected":[{"vendor":"Rakuten Viber","product":"Rakuten Viber Cloak - Android","versions":[{"version":"25.7.2.0g","status":"affected","lessThan":"27.2.0.0g","versionType":"custom"}]},{"vendor":"Rakuten Viber","product":"Rakuten Viber Cloak - Windows","versions":[{"version":"v25.6.0.0","status":"affected","lessThan":"v27.3.0.0","versionType":"custom"}]}],"references":[{"url":"https://www.viber.com/en/download/"}],"problemTypes":[{"descriptions":[{"lang":"en","description":"CWE-327 Use of a Broken or Risky Cryptographic Algorithm"}]},{"descriptions":[{"lang":"en","description":"CWE-693"}]}],"providerMetadata":{"shortName":"certcc","orgId":"37e5125f-f79b-445b-8fad-9564f167944b","dateUpdated":"2026-03-05T16:53:32.465Z"},"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"VINCE 3.0.32","env":"prod","origin":"https://cveawg.mitre.org/api/cve/CVE-2025-13476"}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://www.kb.cert.org/vuls/id/772695"}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2026-03-05T18:35:24.559Z"}},{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":9.8,"attackVector":"NETWORK","baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","integrityImpact":"HIGH","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"NONE","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-03-06T10:34:45.858741Z","id":"CVE-2025-13476","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-03-06T10:36:09.154Z"}}]}}}