Vulnerability in Mozilla Firefox

CVE-2020-6821

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.

EPSS: 0.015 (71.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2020-6821?
CVE-2020-6821 is a high-severity vulnerability in Mozilla Firefox, classified under Use of Uninitialized Resource. CVSS score: 7.5/10. Published 2020-04-24.
How severe is CVE-2020-6821?
High severity. CVSS v3 base score is 7.5 out of 10.