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CVE-2020-26966

6.5 · MEDIUM

Searching for a single word from the address bar caused an mDNS request to be sent on the local network searching for a hostname consisting of that string; resulting in an information leak.

Published Dec 9, 2020EPSS 1.35%

Overview

CVE-2020-26966 is a medium-severity vulnerability. It was published on December 9, 2020 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Searching for a single word from the address bar caused an mDNS request to be sent on the local network searching for a hostname consisting of that string; resulting in an information leak. *Note: This issue only affected Windows operating systems. Other operating systems are unaffected.*. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.

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=1663571Refwww.mozilla.org/security/advisories/mfsa2020-50/Refwww.mozilla.org/security/advisories/mfsa2020-51/Refwww.mozilla.org/security/advisories/mfsa2020-52/Refbugzilla.mozilla.org/show_bug.cgi?id=1663571Refwww.mozilla.org/security/advisories/mfsa2020-50/Refwww.mozilla.org/security/advisories/mfsa2020-51/Refwww.mozilla.org/security/advisories/mfsa2020-52/

How CyberStrike helps

Frequently asked questions

What is CVE-2020-26966?

CVE-2020-26966 is a medium-severity vulnerability. It was published on December 9, 2020 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2020-26966?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2020-26966?

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-2020-26966?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2020-26966 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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