CVE-2025-13476

CRITICAL

Rakuten Viber 25.7.2.0g/25.6.0.0-25.8.1.0 - Info Disclosure

Title source: llm

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)

References (2)

[Various Sources] https://www.viber.com/en/download/

[Third Party Advisory, US Government Resource] https://www.kb.cert.org/vuls/id/772695

Scores

CVSS v3 9.8

EPSS 0.0002

EPSS Percentile 5.2%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment

Exploitation none

Automatable yes

Technical Impact total

Details

CWE

CWE-327

Status published

Products (2)

rakuten/viber 9.3.0.6 25.7.2.0g

rakuten/viber 25.6.0 - 25.8.1.0

Published Mar 05, 2026

Tracked Since Mar 06, 2026