CVE-2025-13476

CRITICAL EPSS 26.4%
Published Mar 5, 20263mo ago · Modified Mar 10, 20263mo ago
9.8 CVSS 3.1
Critical
Find Similar
Published Mar 5, 2026 3mo ago
Last Modified Mar 10, 2026 3mo ago

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)

CVSS Details

Base Score
9.8
Exploitability
3.9
Impact
5.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
26.4% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-327

Affected Products 2

VendorProductVersionRange
rakutenviber*≥25.6.0  –  ≤25.8.1.0
rakutenviber9.3.0.6any

References 2

  • kb.cert.org https://www.kb.cert.org/vuls/id/772695
    Third Party Advisory
  • viber.com https://www.viber.com/en/download/
    Product

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.