CVE Vulnerabilities

CVE-2025-5270

Cleartext Transmission of Sensitive Information

Published: May 27, 2025 | Modified: May 28, 2025
CVSS 3.x
N/A
Source:
NVD
CVSS 2.x
RedHat/V2
RedHat/V3
3.4 LOW
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N
Ubuntu
MEDIUM

In certain cases, SNI could have been sent unencrypted even when encrypted DNS was enabled. This vulnerability affects Firefox < 139.

Weakness

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 * 139.0 (excluding)
Firefox Ubuntu focal *
Mozjs102 Ubuntu esm-apps/noble *
Mozjs102 Ubuntu jammy *
Mozjs102 Ubuntu noble *
Mozjs115 Ubuntu devel *
Mozjs115 Ubuntu noble *
Mozjs115 Ubuntu oracular *
Mozjs115 Ubuntu plucky *
Mozjs52 Ubuntu esm-apps/focal *
Mozjs52 Ubuntu esm-infra/bionic *
Mozjs52 Ubuntu focal *
Mozjs68 Ubuntu focal *
Mozjs78 Ubuntu esm-apps/jammy *
Mozjs78 Ubuntu jammy *
Mozjs91 Ubuntu jammy *
Thunderbird Ubuntu focal *
Thunderbird Ubuntu jammy *

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

References