What’s Vulnerable › Vulnerabilities

CVE-2021-29968

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-06-24 · updated 2026-06-17
• Weakness: CWE-125

Description

When drawing text onto a canvas with WebRender disabled, an out of bounds read could occur. *This bug only affects Firefox on Windows. Other operating systems are unaffected.*. This vulnerability affects Firefox < 89.0.1.

Affected products

• Mozilla Firefox: before 89.0.1 — fixed in 89.0.1

How to fix

Upgrade to a fixed version: Mozilla Firefox 89.0.1. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1712047
• https://www.mozilla.org/security/advisories/mfsa2021-27/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1712047
• https://www.mozilla.org/security/advisories/mfsa2021-27/

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