What’s Vulnerable › Vulnerabilities
CVE-2025-13476: Rakuten Viber uses broken or risky cryptographic Algorithm
- Severity: critical (CVSS 9.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-03-05 · updated 2026-06-17
- Weakness: CWE-327
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)
Affected products
- Rakuten Viber: from 25.6.0 through 25.8.1.0; 9.3.0.6-25.7.2.0g
References
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