CVE-2020-6810

Name: CVE-2020-6810
Creator: NVD / NIST
Published: 2020-03-25T22:15:12.703+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 0.97%

Last modified Jun 17, 2026

CVE-2020-6810 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. After a website had entered fullscreen mode, it could have used a previously opened popup to obscure the notification that indicates the browser is in fullscreen mode. Combined with spoofing the browser chrome, this could have led to confusing the user about the current origin of the page and credential theft or other attacks. EPSS estimates a 0.97% chance of exploitation in the next 30 days.

Description

After a website had entered fullscreen mode, it could have used a previously opened popup to obscure the notification that indicates the browser is in fullscreen mode. Combined with spoofing the browser chrome, this could have led to confusing the user about the current origin of the page and credential theft or other attacks. This vulnerability affects Firefox < 74.

Metrics

CVSS 3.1

4.3/10

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

EPSS Probability

0.97%

57.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-290

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 74.0

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1432856Issue Tracking, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-08/Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1432856Issue Tracking, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-08/Vendor Advisory

Timeline

Published: Mar 25, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-6810?

How severe is CVE-2020-6810?

CVE-2020-6810 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.97% probability of exploitation in the next 30 days.

How do I fix CVE-2020-6810?

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-2020-6810?

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

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Source: NVD / NIST