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Vulnerability record · CVE-2025-13476 · published 5 March 2026

CVE-2025-13476: Rakuten viber broken cryptographic algorithm vulnerability

Rakuten · Viber

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)

9.8 CVSS 3.1 Critical EPSS 0.35% · top 74.6% CWE-327 · Broken cryptographic algorithm
9.8CVSS 3.1 base score
0.35%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.8CVE-2019-18800Rakuten viber missing encryption vulnerabilityViber through 11.7.0.5 allows a remote attacker who can capture a victim's internet traffic to steal their Viber account, because not all Viber proto…EPSS 1.7%7.8CVE-2019-12569Rakuten viber untrusted search path vulnerabilityA vulnerability in Viber before 10.7.0 for Desktop (Windows) could allow an attacker to execute arbitrary commands on a targeted system. This vulnera…EPSS 15%7.5CVE-2020-14049Rakuten viber argument injection vulnerabilityViber for Windows up to 13.2.0.39 does not properly quote its custom URI handler. A malicious website could launch Viber with arbitrary parameters, f…EPSS 2.2%6.3CVE-2025-55996Rakuten viber cross-site scripting vulnerabilityViber Desktop 25.6.0 is vulnerable to HTML Injection via the text parameter of the message compose/forward interfaceEPSS 0.19%5.5CVE-2018-3987Rakuten viber information exposure vulnerabilityAn exploitable information disclosure vulnerability exists in the 'Secret Chats' functionality of Rakuten Viber on Android 9.3.0.6. The 'Secret Chats…EPSS 0.38%

Source: NIST National Vulnerability Database (record CVE-2025-13476), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.