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VULNERABILITIES

CVE-2025-13476 Details

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)

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: CISA-ADPCVSS-B:9.8 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://www.kb.cert.org/vuls/id/772695 CVEThird Party Advisory
https://www.viber.com/en/download/ [email protected]Product

Weakness Enumeration

CWE-IDCWE NameSource
CWE-327Use of a Broken or Risky Cryptographic Algorithm[email protected]

Affected Products

ProductVersions
rakuten viber
>= 25.6.0, <= 25.8.1.0
9.3.0.6 25.7.2.0g

CPE

  • cpe:2.3:a:rakuten:viber:*:*:*:*:*:windows:*:*
  • cpe:2.3:a:rakuten:viber:9.3.0.6:25.7.2.0g:*:*:*:android:*:*

Remediation

  • No remediation found in references.

Change History

6 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2025-13476
NVD Published Date:
Mar 5, 2026
NVD Last Modified:
Jun 17, 2026
Source:
[email protected]
CVE-2025-13476 Details - Not Deferred