Insufficient Validation on Override Codes for Always-Enabled WARP Mode

published 2023-09-07 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-44382

cvss: 5.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 9%
public exploits: 0; none known

Zero Trust Administrators have the ability to disallow end users from disabling WARP on their devices. Override codes can also be created by the Administrators to allow a device to temporarily be disconnected from WARP, however, due to lack of server side validation, an attacker with local access to the device, could extend the maximum allowed disconnected time of WARP client granted by an override code by changing the date & time on the local device where WARP is running.

Patch / fix

fixed in 1

Cloudflare WARP Client 6.29

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 2 y ago (2024-09-26)

Exploit prediction

0.20% chance of exploitation in the next 30 days, higher than 9% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	5.5	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD	3.1	5.5	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected products

Cloudflare WARP Client

Classification

Weakness

CWE-602 Client-Side Enforcement of Server-Side Security
CWE-565 Reliance on Cookies without Validation and Integrity Checking

References

play.google.com /store/apps/details?id=com.cloudflare.onedotonedotonedotone
release-notes, product
developers.cloudflare.com /cloudflare-one/connections/connect-devices/warp/configure-warp/warp-settings/#retrieve-the-override-code
related, technical-description

Sources

CVE List CVE-2023-3747
NVD CVE-2023-3747

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary