Vulnerability Details CVE-2025-13476
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)
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 15.6%
CVSS Severity
CVSS v3 Score 9.8