CVE-2020-6821

HIGH

Firefox < 75.0, Firefox ESR < 68.7.0, Thunderbird < 68.7.0 - Information Disclosure via WebGL copyTexSubImage

Title source: llm
STIX 2.1

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.

References (5)

Core 5
Core References
Issue Tracking, Permissions Required x_refsource_misc
https://bugzilla.mozilla.org/show_bug.cgi?id=1625404
Third Party Advisory vendor-advisory x_refsource_ubuntu
https://usn.ubuntu.com/4335-1/

Scores

CVSS v3 7.5
EPSS 0.0054
EPSS Percentile 67.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Details

CWE
CWE-908
Status published
Products (3)
mozilla/firefox < 75.0
mozilla/firefox_esr < 68.7.0
mozilla/thunderbird < 68.7.0
Published Apr 24, 2020
Tracked Since Feb 18, 2026