CVE-2018-6333

Name: CVE-2018-6333
Creator: NVD / NIST
Published: 2018-12-31T23:29:00.283+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.33%

Last modified Jun 17, 2026

CVE-2018-6333 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. The hhvm-attach deep link handler in Nuclide did not properly sanitize the provided hostname parameter when rendering. As a result, a malicious URL could be used to render HTML and other content inside of the editor's context, which could potentially be chained to lead to code execution. EPSS estimates a 2.33% chance of exploitation in the next 30 days.

Description

The hhvm-attach deep link handler in Nuclide did not properly sanitize the provided hostname parameter when rendering. As a result, a malicious URL could be used to render HTML and other content inside of the editor's context, which could potentially be chained to lead to code execution. This issue affected Nuclide prior to v0.290.0.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

2.33%

81.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Facebook	Nuclide	< 0.290.0

References

https://github.com/facebook/nuclide/commit/65f6bbd683404be1bb569b8d1be84b5d4c74a324Patch, Third Party Advisory
https://github.com/facebook/nuclide/commit/65f6bbd683404be1bb569b8d1be84b5d4c74a324Patch, Third Party Advisory

Timeline

Published: Dec 31, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-6333?

How severe is CVE-2018-6333?

CVE-2018-6333 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.33% probability of exploitation in the next 30 days.

How do I fix CVE-2018-6333?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-6333?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST