Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 75.0 |
| Mozilla | Firefox Esr | < 68.7.0 |
| Mozilla | Thunderbird | < 68.7.0 |
Related Weaknesses (CWE)
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1625404Issue TrackingPermissions Required
- https://usn.ubuntu.com/4335-1/Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-12/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-13/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-14/Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1625404Issue TrackingPermissions Required
- https://usn.ubuntu.com/4335-1/Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-12/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-13/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-14/Vendor Advisory
FAQ
What is CVE-2020-6821?
CVE-2020-6821 is a vulnerability with a CVSS score of 7.5 (HIGH). 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...
How severe is CVE-2020-6821?
CVE-2020-6821 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2020-6821?
Check the references section above for vendor advisories and patch information. Affected products include: Mozilla Firefox, Mozilla Firefox Esr, Mozilla Thunderbird.