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

> An attacker on the local network can view DNS queries from a Windows device using Cloudflare WARP if IPv6 is enabled and specific network conditions are met.

- **Severity:** High 7.4 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 3 Aug 2023
- **Updated:** 17 Oct 2024

## What is CVE-2023-2754?

CVE-2023-2754 is a high-severity vulnerability in Cloudflare WARP, published on 3 Aug 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-319 (Cleartext Transmission of Sensitive Information)

## Which versions are affected by CVE-2023-2754?

It affects 1 product.


Products: Cloudflare Warp.

## How do I fix CVE-2023-2754?

No fix has been published for CVE-2023-2754 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-2754 being exploited?

There is no known exploitation of CVE-2023-2754 in the wild and no public exploit code.

## Other vulnerabilities in Cloudflare WARP

- [CVE-2022-4428](https://insights.sbomify.com/CVE-2022-4428/): support_uri validation missing in WARP client for Windows (high 8.9)
- [CVE-2022-2225](https://insights.sbomify.com/CVE-2022-2225/): Zero Trust Secure Web Gateway policies bypass using WARP client subcommands (high 8.1)
- [CVE-2023-1862](https://insights.sbomify.com/CVE-2023-1862/): Remote access to warp-svc.exe in Cloudflare WARP (high 7.3)
- [CVE-2023-0652](https://insights.sbomify.com/CVE-2023-0652/): Local Privilege Escalation in Cloudflare WARP Installer (Windows) (high 7.0)
- [CVE-2023-1412](https://insights.sbomify.com/CVE-2023-1412/): Local Privilege Escalation Vulnerability in WARP's MSI Installer (high 7.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-2754 and fix it if it is affected.

What it is: CVE-2023-2754 is a high-severity vulnerability in Cloudflare WARP, published on 3 Aug 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-2754 in the wild and no public exploit code.

Affected product: Cloudflare WARP. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2023-2754/ (Markdown: https://insights.sbomify.com/CVE-2023-2754/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-2754
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-2754
- OSV: https://osv.dev/vulnerability/CVE-2023-2754

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-2754/
Summaries are generated and may contain mistakes; the official description above is the record.