{"id":"CVE-2025-13476","aliases":["EUVD-2025-208314","GHSA-7qg4-wvfj-q8vh"],"status":"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)","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-10","score":0.00368,"percentile":0.30969,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-327"],"published":"2026-03-05T16:53:32Z","modified":"2026-06-17T08:34:12Z","products":[{"vendor":"rakuten","product":"viber"},{"vendor":"rakuten viber","product":"rakuten viber cloak - android"},{"vendor":"rakuten viber","product":"rakuten viber cloak - windows"}],"references":[{"url":"https://www.viber.com/en/download/","tags":["Product"]},{"url":"https://www.kb.cert.org/vuls/id/772695","tags":["Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-13476"},{"url":"https://www.viber.com/en/download"},{"url":"https://github.com/advisories/GHSA-7qg4-wvfj-q8vh"}],"sources":{"cve":[{"id":"CVE-2025-13476","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)","status":"published","published":"2026-03-05T16:53:32.465Z","modified":"2026-03-06T10:36:09.154Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"adp"}],"updated_at":"2026-11-02T14:32:43.437394Z"}],"euvd":[{"id":"EUVD-2025-208314","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)","status":"published","published":"2026-03-05T16:53:32Z","modified":"2026-03-06T10:36:09Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T19:48:08.258323Z"}],"ghsa":[{"id":"GHSA-7qg4-wvfj-q8vh","title":"Rakuten Viber Cloak mode in Android v25.7.2.0g and Windows v25.6.0.0–v25.8.1.0 uses a static and...","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)","status":"published","published":"2026-03-05T21:30:45Z","modified":"2026-03-10T21:32:12Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-327"],"updated_at":"2026-11-02T15:06:33.229996Z"}],"nvd":[{"id":"CVE-2025-13476","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)","status":"published","published":"2026-03-05T19:15:58.283Z","modified":"2026-06-17T08:34:12.95Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"secondary"}],"cwes":["CWE-327"],"updated_at":"2026-11-02T14:12:01.096037Z"}]}}