CVE-2020-26966

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.

6.5

CVSS

Severity: Medium

CVSS 3.1 •

CVSS 2.0 •

EPSS 0.44%

Vendor Advisory mozilla.org Vendor Advisory mozilla.org Vendor Advisory mozilla.org Vendor Advisory mozilla.org

Affected: Mozilla Firefox

Affected: Mozilla Firefox ESR

Affected: Mozilla Thunderbird

References

Link	Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=1663571	issue tracking permissions required vendor advisory
https://www.mozilla.org/security/advisories/mfsa2020-50/	vendor advisory
https://www.mozilla.org/security/advisories/mfsa2020-52/	vendor advisory
https://www.mozilla.org/security/advisories/mfsa2020-51/	vendor advisory

Frequently Asked Questions

What is the severity of CVE-2020-26966?: CVE-2020-26966 has been scored as a medium severity vulnerability.
How to fix CVE-2020-26966?: To fix CVE-2020-26966, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-26966 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2020-26966 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2020-26966?: CVE-2020-26966 affects Mozilla Firefox, Mozilla Firefox ESR, Mozilla Thunderbird.

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