Rakuten Viber uses broken or risky cryptographic Algorithm
Priority MEDIUM 49CWE-327Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-327.
Summary
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)
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00368 30th percentileScored 2026-11-07
Fix Fixed Rakuten Viber Cloak - Android (Rakuten Viber): 27.2.0.0gRakuten Viber Cloak - Windows (Rakuten Viber): v27.3.0.0
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Rakuten Viber | Rakuten Viber Cloak - Android | 25.7.2.0g to before 27.2.0.0g | 27.2.0.0g | Patch available | CNA |
| Rakuten Viber | Rakuten Viber Cloak - Windows | v25.6.0.0 to before v27.3.0.0 | v27.3.0.0 | Patch available | CNA |
- Rakuten Viber Cloak - Android VendorRakuten Viber Affected 25.7.2.0g to before 27.2.0.0g Fixed in 27.2.0.0g Patch available CNA
- Rakuten Viber Cloak - Windows VendorRakuten Viber Affected v25.6.0.0 to before v27.3.0.0 Fixed in v27.3.0.0 Patch available CNA
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:rakuten:viber:*:*:*:*:*:windows:*:* | 25.6.0 – 25.8.1.0 | Vulnerable | Rakuten Mobile, Inc. |
| cpe:2.3:a:rakuten:viber:9.3.0.6:25.7.2.0g:*:*:*:android:*:* | 9.3.0.6 25.7.2.0g | Vulnerable | Rakuten Mobile, Inc. |
- cpe:2.3:a:rakuten:viber:*:*:*:*:*:windows:*:* Versions 25.6.0 – 25.8.1.0 Vulnerable ·Rakuten Mobile, Inc.
- cpe:2.3:a:rakuten:viber:9.3.0.6:25.7.2.0g:*:*:*:android:*:* Versions 9.3.0.6 25.7.2.0g Vulnerable ·Rakuten Mobile, Inc.
Remediation
- Fix · CNA Rakuten Viber Cloak - Android (Rakuten Viber) Fixed in 27.2.0.0g
- Fix · CNA Rakuten Viber Cloak - Windows (Rakuten Viber) Fixed in v27.3.0.0
Timeline
- 2026-10-02 Threatist record created from CVE-2025-13476
- 2026-10-03 Alias added: GHSA-7qg4-wvfj-q8vh
References
More Rakuten Mobile, Inc. Viber vulnerabilities
- TI-2025-35211 Viber Desktop 25.6.0 is vulnerable to HTML Injection via the text parameter of the message compose/forward interface CVSS 3.1MEDIUM 6.3
- TI-2019-09383 A vulnerability in Viber before 10.7.0 for Desktop (Windows) could allow an attacker to… CVSS 3.0HIGH 7.8
- TI-2019-13537 Viber through 11.7.0.5 allows a remote attacker who can capture a victim's internet… CVSS 3.1HIGH 8.8
- TI-2020-11005 Viber for Windows up to 13.2.0.39 does not properly quote its custom URI handler. CVSS 3.1HIGH 7.5
- TI-2018-02955 Information disclosure in Rakuten Viber CVSS 3.1MEDIUM 5.5
Sources
- CVE-2025-13476 · CVE Program
- CVE-2025-13476 · NVD
- FIRST EPSS
- GHSA-7qg4-wvfj-q8vh · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences