CVE-2023-2754

DNS query disclosure via non-loopback IPv6 resolver

Published Aug 3, 2023 · Updated Oct 17, 2024

Cleartext DNS transmission in Cloudflare WARP for Windows before 2023.7.160.0 allows attackers to read DNS queries on rogue IPv6 Wi-Fi. The client assigns a Unique Local Address rather than an IPv6 loopback address as its DNS server, allowing a device claiming that address to receive queries. The device must join a rogue Wi-Fi network that advertises IPv6 and claims the exact assigned DNS address; exposure is limited to that network condition.

CVSS severity7.4
High
EPSS probability0.92%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cleartext DNS transmission in Cloudflare WARP for Windows before 2023.7.160.0 allows attackers to read DNS queries on rogue IPv6 Wi-Fi. The client assigns a Unique Local Address rather than an IPv6 loopback address as its DNS server, allowing a device claiming that address to receive queries. The device must join a rogue Wi-Fi network that advertises IPv6 and claims the exact assigned DNS address; exposure is limited to that network condition.

The record

CVE
CVE-2023-2754
Published
Aug 3, 2023
Updated
Oct 17, 2024
Vendor
Cloudflare
Product
Cloudflare WARP
Classifications
CWE-319, CAPEC-117, T1557
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 3, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 17, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2023.7.160.0 changes=[{"at":"2023.7.160.0","status":"unaffected"}]

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Cloudflare · Cloudflare WARPversion=0 <2023.7.160.0 changes=[{"at":"2023.7.160.0","status":"unaffected"}]

Published CVSS scores

7.4CloudflareCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-319Cleartext Transmission of Sensitive Information
CAPEC-117Interception
T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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