CVE-2023-2754

Plaintext transmission of DNS requests in Windows 1.1.1.1 WARP client

Published Aug 3, 2023 CVSS 3.1 · 7.4 High EPSS < 1% KEV · Not listed
Description
The Cloudflare WARP client for Windows assigns loopback IPv4 addresses for the DNS Servers, since WARP acts as local DNS server that performs DNS queries in a secure manner, however, if a user is connected to WARP over an IPv6-capable network, te WARP client did not assign loopback IPv6 addresses but Unique Local Addresses, which under certain conditions could point towards unknown devices in the same local network which enables an Attacker to view DNS queries made by the device.


Remediation

Vendor Solution

Users are encouraged to update to the latest WARP Client (Windows) version available: 2023.7.160.0


Vendor Workaround

Disabling IPv6 support in local devices

Tracking

Sign in to view the affected projects.

Advisories

Source ID Title
EUVD EUVD EUVD-2023-34213 The Cloudflare WARP client for Windows assigns loopback IPv4 addresses for the DNS Servers, since WARP acts as local DNS server that performs DNS queries in a secure manner, however, if a user is connected to WARP over an IPv6-capable network, te WARP client did not assign loopback IPv6 addresses but Unique Local Addresses, which under certain conditions could point towards unknown devices in the same local network which enables an Attacker to view DNS queries made by the device.
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
cloudflare
Published
Updated
Oct 17, 2024, 2:12 PM
Reserved
May 17, 2023, 7:55 AM
Status
Modified
Published
Aug 3, 2023, 3:15 PM
Modified
Jun 17, 2026, 5:53 AM