CVE-2021-29968

HIGH
8.1
CVSS Score
Published: June 24, 2021 at 01:14 PM UTC
Updated: June 17, 2026 at 03:48 AM UTC
1 product affected across 1 vendorFirefox· also runs on 1 platform

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Severity
HIGH8.1
Exploit prediction
EPSS 0.8%

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 89.0.1
Affected range stops below 89.0.1, so it looks safe — our inference, not a vendor statement
microsoft-windows (environment)

Runs on — not affected

The affected product only carries this flaw when running on these platforms. The platforms themselves are not vulnerable.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (2)

x_refsource_MISCIssue TrackingPermissions RequiredVendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1712047
x_refsource_MISCRelease NotesVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2021-27/

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-125

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