CVE-2020-26966
First published: Tue Nov 17 2020(Updated: )
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.
Credit: security@mozilla.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Mozilla Firefox ESR | <78.5 | 78.5 |
| <83 | 83 | |
| <78.5 | 78.5 | |
| <78.5 | 78.5 | |
| Mozilla Firefox | <83.0 | |
| Mozilla Firefox ESR | <78.5 | |
| Mozilla Thunderbird | <78.5 | |
| Microsoft Windows |
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Reference Links
- https://bugzilla.mozilla.org/show_bug.cgi?id=1663571
- https://www.mozilla.org/en-US/security/advisories/mfsa2020-51/
- https://www.mozilla.org/en-US/security/advisories/mfsa2020-50/
- https://www.mozilla.org/en-US/security/advisories/mfsa2020-52/
- https://www.mozilla.org/security/advisories/mfsa2020-50/
- https://www.mozilla.org/security/advisories/mfsa2020-51/
- https://www.mozilla.org/security/advisories/mfsa2020-52/
Peer vulnerabilities
(Found alongside the following vulnerabilities)
Frequently Asked Questions
What is CVE-2020-26966?
CVE-2020-26966 is a vulnerability that affects Windows operating systems and allows for an information leak when searching for a single word from the address bar in Mozilla Firefox and Thunderbird.
Which operating systems are affected by CVE-2020-26966?
Only Windows operating systems are affected by CVE-2020-26966.
Which software versions are affected by CVE-2020-26966?
Mozilla Firefox ESR versions up to 78.5, Mozilla Thunderbird up to 78.5, and Mozilla Firefox up to version 83.0 are affected by CVE-2020-26966.
What is the severity of CVE-2020-26966?
CVE-2020-26966 has a severity rating of 6.5 (Medium).
How can I fix CVE-2020-26966?
To mitigate the vulnerability, update Mozilla Firefox ESR to version 78.5, Mozilla Thunderbird to version 78.5, and Mozilla Firefox to version 83.0 or later.
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