CVE-2020-6813: Medium severity Mozilla Firefox vulnerability
Last updated 25 August 2025
Other sources
When protecting CSS blocks with the nonce feature of Content Security Policy, the @import statement in the CSS block could allow an attacker to inject arbitrary styles, bypassing the intent of the Content Security Policy.
Affected Software
Event History
Peer vulnerabilities
Found alongside the following vulnerabilities.
Frequently Asked Questions
What is vulnerability CVE-2020-6813?
Vulnerability CVE-2020-6813 is a security flaw in Mozilla Firefox that allows an attacker to inject arbitrary styles by bypassing the Content Security Policy.
How does vulnerability CVE-2020-6813 affect Mozilla Firefox?
Vulnerability CVE-2020-6813 affects Mozilla Firefox versions up to version 74. It allows an attacker to inject arbitrary styles by bypassing the Content Security Policy.
What is the severity of vulnerability CVE-2020-6813?
The severity of vulnerability CVE-2020-6813 is low.
How can I fix vulnerability CVE-2020-6813 in Mozilla Firefox?
To fix vulnerability CVE-2020-6813 in Mozilla Firefox, update to version 74 or higher.
Where can I find more information about vulnerability CVE-2020-6813?
You can find more information about vulnerability CVE-2020-6813 on Mozilla's website and Bugzilla.