VDB

CVE-2025-13476

CVE-2025-13476 PUBLISHED CVSS 9.800000190734863 CRITICAL

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)

EPSS 0.02% · 5.7th percentile

Risk Scores

CVSS 3.1
9.800000190734863
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score
0.02%
5.7th percentile

Affected Products

VendorProductVersions
Rakuten ViberRakuten Viber Cloak - Windowsv25.6.0.0, 25.6.0.0, v25.6.0.0
rakutenviber9.3.0.6, 25.6.0, 9.3.0.6
Rakuten ViberRakuten Viber Cloak - Android25.7.2.0g, 25.7.2.0g, 25.7.2.0g

Timeline

  • Nov 20, 2025 CVE ID Reserved
  • Mar 5, 2026 CVE Published
  • Mar 6, 2026 EPSS Score
  • Mar 6, 2026 CVE Updated
  • Mar 7, 2026 EPSS Score
  • Mar 8, 2026 EPSS Score
  • Mar 10, 2026 EPSS Score
  • Mar 11, 2026 EPSS Score
  • Mar 12, 2026 EPSS Score
  • Mar 13, 2026 EPSS Score
  • Mar 14, 2026 EPSS Score
  • Mar 16, 2026 EPSS Score
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