CVE-2023-6211

Name: CVE-2023-6211
Creator: NVD / NIST
Published: 2023-11-21T15:15:08.057+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.49%

Last modified Jun 17, 2026

CVE-2023-6211 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. If an attacker needed a user to load an insecure http: page and knew that user had enabled HTTPS-only mode, the attacker could have tricked the user into clicking to grant an HTTPS-only exception if they could get the user to participate in a clicking game. This vulnerability affects Firefox < 120.. EPSS estimates a 0.49% chance of exploitation in the next 30 days.

Description

If an attacker needed a user to load an insecure http: page and knew that user had enabled HTTPS-only mode, the attacker could have tricked the user into clicking to grant an HTTPS-only exception if they could get the user to participate in a clicking game. This vulnerability affects Firefox < 120.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

0.49%

38.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-1021

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 120.0

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1850200Issue Tracking, Permissions Required
https://security.gentoo.org/glsa/202401-10
https://www.mozilla.org/security/advisories/mfsa2023-49/Release Notes, Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1850200Issue Tracking, Permissions Required
https://security.gentoo.org/glsa/202401-10
https://www.mozilla.org/security/advisories/mfsa2023-49/Release Notes, Vendor Advisory

Timeline

Published: Nov 21, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-6211?

How severe is CVE-2023-6211?

CVE-2023-6211 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.49% probability of exploitation in the next 30 days.

How do I fix CVE-2023-6211?

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-2023-6211?

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

Scan your code now

Source: NVD / NIST