Go to homepageCyberStrike

Menu

Star on GitHub · 3.2k
Sign inDownload

CVE-2020-6821

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.

Published Apr 24, 2020CWE-908EPSS 1.50%

Overview

CVE-2020-6821 is a high-severity vulnerability. It was published on April 24, 2020 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refbugzilla.mozilla.org/show_bug.cgi?id=1625404Refusn.ubuntu.com/4335-1/Refwww.mozilla.org/security/advisories/mfsa2020-12/Refwww.mozilla.org/security/advisories/mfsa2020-13/Refwww.mozilla.org/security/advisories/mfsa2020-14/Refbugzilla.mozilla.org/show_bug.cgi?id=1625404Refusn.ubuntu.com/4335-1/Refwww.mozilla.org/security/advisories/mfsa2020-12/Refwww.mozilla.org/security/advisories/mfsa2020-13/Refwww.mozilla.org/security/advisories/mfsa2020-14/

How CyberStrike helps

Frequently asked questions

What is CVE-2020-6821?

CVE-2020-6821 is a high-severity vulnerability. It was published on April 24, 2020 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2020-6821?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2020-6821?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2020-6821?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2020-6821 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

Related HIGH CVEs from 2020

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999