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)

Viber Desktop 25.6.0 is vulnerable to HTML Injection via the text parameter of the message compose/forward interface

Missing authentication for critical function vulnerability exists in Rakuten Turbo 5G firmware version V1.3.18 and earlier. If this vulnerability is exploited, a remote unauthenticated attacker may update or downgrade the firmware on the device.

Improper neutralization of special elements used in an OS command ('OS Command Injection') issue exists in Rakuten Turbo 5G firmware version V1.3.18 and earlier. If this vulnerability is exploited, a remote authenticated attacker may execute an arbitrary OS command.

Exposure of sensitive system information to an unauthorized control sphere issue exists in Rakuten Turbo 5G firmware version V1.3.18 and earlier. If this vulnerability is exploited, a remote unauthenticated attacker may obtain information of the other devices connected through the Wi-Fi.

'Rakuten Ichiba App' for Android 12.4.0 and earlier and 'Rakuten Ichiba App' for iOS 11.7.0 and earlier are vulnerable to improper authorization in handler for custom URL scheme. An arbitrary site may be displayed on the WebView of the product via Intent from another application installed on the user's device. As a result, the user may be redirected to an unauthorized site, and the user may become a victim of a phishing attack.

UNSUPPPORTED WHEN ASSIGNED Improper authentication vulnerability in Rakuten WiFi Pocket all versions allows a network-adjacent attacker to log in to the product's Management Screen. As a result, sensitive information may be obtained and/or the settings may be changed.

Rakuten Casa version APFV141 or APFV200 uses a hard-coded credential which may allow a remote unauthenticated attacker to log in with the root privilege and perform an arbitrary operation.

Improper access control vulnerability in Rakuten Casa version APFV141 or APFV200 allows a remote attacker to log in with the root privilege and perform an arbitrary operation if the product is in its default settings in which is set to accept SSH connections from the WAN side, and is also connected to the Internet with the authentication information unchanged from the default settings.

Improper access control vulnerability in Rakuten Casa version APFV141 or APFV200 allows a remote attacker to obtain the information stored in the product because the product is set to accept HTTP connections from the WAN side by default.

Viber 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, forcing a victim to send an NTLM authentication request, and either relay the request or capture the hash for offline password cracking. NOTE: this issue exists because of an incomplete fix for CVE-2019-12569.

An exploitable information disclosure vulnerability exists in the 'Secret Chats' functionality of Rakuten Viber on Android 9.3.0.6. The 'Secret Chats' functionality allows a user to delete all traces of a chat either by using a time trigger or by direct request. There is a bug in this functionality which leaves behind photos taken and shared on the secret chats, even after the chats are deleted. These photos will be stored in the device and accessible to all applications installed on the Android device.

Rakuma App for Android version 7.15.0 and earlier, and for iOS version 7.16.4 and earlier allows an attacker to bypass authentication and obtain the user's authentication information via a malicious application created by the third party.

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 viberudid 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.

A vulnerability in Viber before 10.7.0 for Desktop (Windows) could allow an attacker to execute arbitrary commands on a targeted system. This vulnerability is due to unsafe search paths used by the application URI. An attacker could exploit this vulnerability by convincing a targeted user to follow a malicious link. Successful exploitation could cause the application to load libraries from the directory targeted by the URI link. The attacker could use this behavior to execute arbitrary commands on the system with the privileges of the targeted user, if the attacker can place a crafted library in a directory that is accessible to the vulnerable system.