EUVD-2025-208314

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...

CVE-2025-13476

Rakuten Viber's Cloak mode is vulnerable to identification by Deep Packet Inspection (DPI) systems due to a flawed TLS handshake implementation. Specifically, the application uses a static and predictable TLS ClientHello fingerprint that lacks extension diversity in Android v25.7.2.0g and Windows...

A flawed TLS handshake implementation affects Viber Proxy in multiple platforms

Overview The Rakuten Viber messaging app for Android V25.7.2.0g and Windows V25.6.0.0-V25.8.1.0, has a flaw in its TLS handshake implementation when using the Cloak proxy configuration. This flaw allows for easy identification of proxy usage, potentially compromising user anonymity. Description...