Windows
CVE-2025-13476
CRITICAL
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
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)
AnalysisAI
Static TLS fingerprint in Rakuten Viber Cloak mode enables tracking despite privacy mode.
Technical ContextAI
CWE-327 predictable TLS ClientHello.
RemediationAI
Update Viber.
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External POC / Exploit Code
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