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TI-2019-13537 Aliases CVE-2019-18800GHSA-h624-wrj8-hr3r

Viber through 11.7.0.5 allows a remote attacker who can capture a victim's internet…

Priority MEDIUM 41CWE-311Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-311.

Summary

Viber 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 protocol traffic is encrypted. TCP data packet 9 on port 4244 from the victim's device contains cleartext information such as the device model and OS version, IMSI, and 20 bytes of udid in a binary format, which is located at offset 0x14 of this packet. Then, the attacker installs Viber on his device, initiates the registration process for any phone number, but doesn't enter a pin from SMS. Instead, he closes Viber. Next, the attacker rewrites his udid with the victim's udid, modifying the viber_udid file, which is located in the Viber preferences folder. (The udid is stored in a hexadecimal format.) Finally, the attacker starts Viber again and enters the pin from SMS.

Why it matters now

EPSS 0.01662 76th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:rakuten:viber:*:*:*:*:*:android:*:*up to 11.7.0.5VulnerableRakuten Mobile, Inc.
  • cpe:2.3:a:rakuten:viber:*:*:*:*:*:android:*:* Versions up to 11.7.0.5 Vulnerable ·Rakuten Mobile, Inc.

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2019-18800
  2. 2026-10-03 Alias added: GHSA-h624-wrj8-hr3r

References

Exploit 1

  • 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-2025-12320 Rakuten Viber uses broken or risky cryptographic Algorithm CVSS 3.1CRITICAL 9.8
  • 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

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences