CVE-2020-6813

Description

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. This vulnerability affects Firefox < 74.

5.3

CVSS

Severity: Medium

CVSS 3.1 •

CVSS 2.0 •

EPSS 0.11%

Vendor Advisory mozilla.org Vendor Advisory mozilla.org

Affected: Mozilla Firefox

References

Link	Tags
https://www.mozilla.org/security/advisories/mfsa2020-08/	vendor advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1605814	vendor advisory permissions required

Frequently Asked Questions

What is the severity of CVE-2020-6813?: CVE-2020-6813 has been scored as a medium severity vulnerability.
How to fix CVE-2020-6813?: To fix CVE-2020-6813, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-6813 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2020-6813 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2020-6813?: CVE-2020-6813 affects Mozilla Firefox.

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