CVE-2025-13476 — Rakuten Viber uses broken or risky cryptographic Algorithm

Description (CNA)

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 (CNA)

Vendor / product	Versions
Rakuten Viber / Rakuten Viber Cloak - Android	affected 25.7.2.0g before 27.2.0.0g
Rakuten Viber / Rakuten Viber Cloak - Windows	affected v25.6.0.0 before v27.3.0.0

CWE

No CWE identifiers supplied.

References

https://www.viber.com/en/download/

ADP enrichment

CVE

No English description supplied.

https://www.kb.cert.org/vuls/id/772695

CISA-ADP

No English description supplied.

No references supplied.