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)
Published: 2026-03-05
Score: 9.8 Critical
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Tue, 10 Mar 2026 20:00:00 +0000

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

Fri, 06 Mar 2026 15:30:00 +0000

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

Fri, 06 Mar 2026 11:15:00 +0000

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'}


Thu, 05 Mar 2026 19:30:00 +0000

Type Values Removed Values Added
References

Thu, 05 Mar 2026 18:15:00 +0000

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

Subscriptions

Rakuten Viber
Rakuten Viber Rakuten Viber Cloak - Android Rakuten Viber Cloak - Windows
cve-icon MITRE

Status: PUBLISHED

Assigner: certcc

Published:

Updated: 2026-03-06T10:36:09.154Z

Reserved: 2025-11-20T12:38:19.605Z

Link: CVE-2025-13476

cve-icon Vulnrichment

Updated: 2026-03-05T18:35:24.559Z

cve-icon NVD

Status : Analyzed

Published: 2026-03-05T19:15:58.283

Modified: 2026-03-10T19:49:55.930

Link: CVE-2025-13476

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-03-06T15:01:33Z

Weaknesses