CVE-2020-6821

HighCVSS 7.5/10Last modified Jun 17, 2026

Description

When reading from areas partially or fully outside the source resource with WebGL's <code>copyTexSubImage</code> method, the specification requires the returned values be zero. Previously, this memory was uninitialized, leading to potentially sensitive data disclosure. This vulnerability affects Thunderbird < 68.7.0, Firefox ESR < 68.7, and Firefox < 75.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Weakness enumeration

CWE-908

Affected software

No affected versions have been published.

Timeline

Published: Apr 24, 2020
Last modified: Jun 17, 2026
NVD status: Modified

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