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CVE-2020-6806

8.8 · HIGH

By carefully crafting promise resolutions, it was possible to cause an out-of-bounds read off the end of an array resized during script execution.

Published Mar 25, 2020CWE-125EPSS 2.61%

Overview

CVE-2020-6806 is a high-severity vulnerability. It was published on March 25, 2020 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

By carefully crafting promise resolutions, it was possible to cause an out-of-bounds read off the end of an array resized during script execution. This could have led to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 68.6, Firefox < 74, Firefox < ESR68.6, and Firefox ESR < 68.6.

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

Refpacketstormsecurity.com/files/157524/Firefox-js-ReadableStreamCloseInternal-Out-Of-Bounds-Access.htmlRefbugzilla.mozilla.org/show_bug.cgi?id=1612308Refusn.ubuntu.com/4328-1/Refusn.ubuntu.com/4335-1/Refwww.mozilla.org/security/advisories/mfsa2020-08/Refwww.mozilla.org/security/advisories/mfsa2020-09/Refwww.mozilla.org/security/advisories/mfsa2020-10/Refpacketstormsecurity.com/files/157524/Firefox-js-ReadableStreamCloseInternal-Out-Of-Bounds-Access.htmlRefbugzilla.mozilla.org/show_bug.cgi?id=1612308Refusn.ubuntu.com/4328-1/

How CyberStrike helps

Frequently asked questions

What is CVE-2020-6806?

CVE-2020-6806 is a high-severity vulnerability. It was published on March 25, 2020 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2020-6806?

This vulnerability has a CVSS 3.1 base score of 8.8, 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-2020-6806?

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-2020-6806?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2020-6806 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.

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