What is the CVSS score of CVE-2025-13476?

CVE-2025-13476 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.0%.

Which versions of Windows are affected by CVE-2025-13476?

Rakuten Viber's Cloak mode (privacy/circumvention feature) on Android and Windows devices contains a critical flaw that allows network monitoring systems to identify and block Viber traffic despite…

How to fix or mitigate CVE-2025-13476?

Within 24 hours: Inventory all Rakuten Viber deployments across Android (v25.7.2.0g) and Windows (v25.6.0.0–v25.8.1.0) devices; disable Cloak mode feature organization-wide via Mobile Device Management (MDM) or endpoint management policies and communicate restriction to users. Within 7 days: Conduct audit of any communications relying on Cloak mode for security; evaluate alternative circumvention or privacy tools if needed for business operations. Within 30 days: Monitor Rakuten security advisories for patch release; establish process for rapid deployment once available; consider organizational policy on use of Viber for sensitive communications pending remediation.

Windows CVE-2025-13476

CRITICAL

Use of a Broken or Risky Cryptographic Algorithm (CWE-327)

2026-03-05 cret@cert.org

Windows TLS Android Viber Rakuten

9.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.8 CRITICAL

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 22:06 vuln.today

CVE Published

Mar 05, 2026 - 19:15 nvd

CRITICAL 9.8

DescriptionCVE.org

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)

AnalysisAI

Static TLS fingerprint in Rakuten Viber Cloak mode enables tracking despite privacy mode.

Technical ContextAI

CWE-327 predictable TLS ClientHello.

RemediationAI

Update Viber.

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CVE-2025-13476 vulnerability details – vuln.today

Back

Windows CVE-2025-13476

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

Technical ContextAI

RemediationAI

More in Windows

Same weakness CWE-327 – Use of a Broken or Risky Cryptographic Algorithm

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External POC / Exploit Code