What’s Vulnerable › Vulnerabilities

CVE-2020-12407

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-07-09 · updated 2026-06-17
• Weakness: CWE-125

Description

Mozilla Developer Nicolas Silva found that when using WebRender, Firefox would under certain conditions leak arbitrary GPU memory to the visible screen. The leaked memory content was visible to the user, but not observable from web content. This vulnerability affects Firefox < 77.

Affected products

• Mozilla Firefox: before 77.0 — fixed in 77.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 77.0. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1637112
• https://www.mozilla.org/security/advisories/mfsa2020-20/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1637112
• https://www.mozilla.org/security/advisories/mfsa2020-20/

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