What’s Vulnerable › Vulnerabilities

CVE-2023-2754: Plaintext transmission of DNS requests in Windows 1.1.1.1 WARP client

• Severity: medium (CVSS 6.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-08-03 · updated 2026-06-17
• Weakness: CWE-319

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.

Affected products

• Cloudflare WARP: before 2023.7.160.0 — fixed in 2023.7.160.0

How to fix

Upgrade to a fixed version: Cloudflare WARP 2023.7.160.0. Check the vendor advisory for mitigations.

References

• https://developers.cloudflare.com/warp-client/
• https://github.com/cloudflare/advisories/security/advisories/GHSA-mv6g-7577-vq4w
• https://install.appcenter.ms/orgs/cloudflare/apps/1.1.1.1-windows-1/distribution_groups/release
• https://developers.cloudflare.com/warp-client/
• https://github.com/cloudflare/advisories/security/advisories/GHSA-mv6g-7577-vq4w
• https://install.appcenter.ms/orgs/cloudflare/apps/1.1.1.1-windows-1/distribution_groups/release

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