CVE Vulnerabilities


Cleartext Transmission of Sensitive Information

Published: Dec 22, 2022 | Modified: Dec 29, 2022
CVSS 3.x
CVSS 2.x

When clicking on a tel: link, USSD codes, specified after a * character, would be included in the phone number. On certain phones, or on certain carriers, if the number was dialed this could perform actions on a users account, similar to a cross-site request forgery attack.This bug only affects Firefox for Android. Other operating systems are unaffected.. This vulnerability affects Firefox < 97.


The product transmits sensitive or security-critical data in cleartext in a communication channel that can be sniffed by unauthorized actors.

Affected Software

Name Vendor Start Version End Version
Firefox Mozilla * 97.0 (excluding)
Firefox Ubuntu trusty *
Firefox Ubuntu upstream *

Extended Description

Many communication channels can be “sniffed” (monitored) by adversaries during data transmission. For example, in networking, packets can traverse many intermediary nodes from the source to the destination, whether across the internet, an internal network, the cloud, etc. Some actors might have privileged access to a network interface or any link along the channel, such as a router, but they might not be authorized to collect the underlying data. As a result, network traffic could be sniffed by adversaries, spilling security-critical data. Applicable communication channels are not limited to software products. Applicable channels include hardware-specific technologies such as internal hardware networks and external debug channels, supporting remote JTAG debugging. When mitigations are not applied to combat adversaries within the product’s threat model, this weakness significantly lowers the difficulty of exploitation by such adversaries. When full communications are recorded or logged, such as with a packet dump, an adversary could attempt to obtain the dump long after the transmission has occurred and try to “sniff” the cleartext from the recorded communications in the dump itself.

Potential Mitigations