CVE-2020-6813 Security feature bypass in Firefox

What is CVE-2020-6813?

CVE-2020-6813 is a medium-severity vulnerability in Mozilla Firefox, published on 25 Mar 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Which versions are affected by CVE-2020-6813?

It affects 1 product.

Products include Mozilla Firefox.

How do I fix CVE-2020-6813?

Upgrade to a fixed version.

Is CVE-2020-6813 being exploited?

There is no known exploitation of CVE-2020-6813 in the wild and no public exploit code.

Other vulnerabilities in Mozilla Firefox

• CVE-2019-11708 Mozilla Firefox and Thunderbird Sandbox Escape Exploited Critical 10.0
• CVE-2010-3765 Mozilla Multiple Products Remote Code Execution Exploited Critical 9.8
• CVE-2022-26486 Mozilla Firefox Use-After-Free Exploited Critical 9.6
• CVE-2022-26485 Mozilla Firefox Use-After-Free Exploited High 8.8
• CVE-2019-11707 Mozilla Firefox and Thunderbird Type Confusion Exploited High 8.8

All Mozilla Firefox vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-ghv2-cp6r-w334, UBUNTU-CVE-2020-6813.