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Critical severity9.8NVD Advisory· Published Mar 5, 2026· Updated Jun 17, 2026

CVE-2025-13476

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)

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

5
  • Rakuten/Viber3 versions
    cpe:2.3:a:rakuten:viber:*:*:*:*:*:windows:*:*+ 2 more
    • cpe:2.3:a:rakuten:viber:*:*:*:*:*:windows:*:*range: >=25.6.0,<=25.8.1.0
    • cpe:2.3:a:rakuten:viber:9.3.0.6:25.7.2.0g:*:*:*:android:*:*
    • (no CPE)range: Android v25.7.2.0g, Windows v25.6.0.0–v25.8.1.0
  • Rakuten Viber/Rakuten Viberllm-fuzzy
    Range: Android v25.7.2.0g, Windows v25.6.0.0–v25.8.1.0
  • Rakuten Viber/Rakuten Viber Cloak Androidv5
    Range: 25.7.2.0g

Patches

Vulnerability mechanics

References

2

News mentions

0

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