CVE ID:	CVE-2020-6821
Description:	When reading from areas partially or fully outside the source resource with WebGL's copyTexSubImage 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.
Test IDs:	None available
Cross References:	Common Vulnerability Exposure (CVE) ID: CVE-2020-6821 https://bugzilla.mozilla.org/show_bug.cgi?id=1625404 https://www.mozilla.org/security/advisories/mfsa2020-12/ https://www.mozilla.org/security/advisories/mfsa2020-13/ https://www.mozilla.org/security/advisories/mfsa2020-14/ https://usn.ubuntu.com/4335-1/