CVE-2025-13476CRITICAL 9.8EPSS p26.2%

CVE-2025-13476CVE-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)

Scoring

CVSS 3.19.8 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS0.34% probability of exploitation · percentile 26.2% · 2026-06-19T12:03:05Z
Published2026-03-05
Last modified2026-03-10

Underlying weaknesses· 1

CWE-327

References

  1. https://www.viber.com/en/download/
  2. https://www.kb.cert.org/vuls/id/772695

1

TypeTargetConfidenceTier
WeaknessUse of a Broken or Risky Cryptographic Algorithmcwe-3270%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.