CVE-2025-13476
Critical
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)
SeverityCritical
CVSS9.8
Exploit probability—
Product
Rakuten Viber
PublishedMar 5, 2026
First seenMar 5, 2026
Weakness typeCWE-327CWE-327CWE-693CWE-693
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| rakuten viber | 25.6.0 ≤ v ≤ 25.8.1.0, 9.3.0.6 | — |
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