CVE-2025-13476

Rakuten Viber uses broken or risky cryptographic Algorithm

Published Mar 5, 2026 CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed
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)

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Rakuten
Rakuten viber
Weaknesses CWE-327
CPEs cpe:2.3:a:rakuten:viber:*:*:*:*:*:windows:*:*
cpe:2.3:a:rakuten:viber:9.3.0.6:25.7.2.0g:*:*:*:android:*:*
Vendors & Products Rakuten
Rakuten viber
Type Values Removed Values Added
First Time appeared Rakuten Viber
Rakuten Viber rakuten Viber Cloak - Android
Rakuten Viber rakuten Viber Cloak - Windows
Vendors & Products Rakuten Viber
Rakuten Viber rakuten Viber Cloak - Android
Rakuten Viber rakuten Viber Cloak - Windows
Type Values Removed Values Added
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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)
Title Rakuten Viber uses broken or risky cryptographic Algorithm
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
certcc
Published
Updated
Mar 6, 2026, 10:36 AM
Reserved
Nov 20, 2025, 12:38 PM
Status
Analyzed
Published
Mar 5, 2026, 7:15 PM
Modified
Jun 17, 2026, 8:34 AM