Firefox ESR and 2 others: Searching for a single word from the address bar caused an mDNS request to be sent on the local network…
CVE-2020-26966 is fixed in 2 products on 1 platform, first by Mozilla Thunderbird (en-US) 78.10.0, released April 15, 2021. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Windows apps | |||
| Mozilla Firefox ESR (en-US) | 91.0 | Mozilla Firefox ESR (en-US) 91.0 | Aug 4, 2021 |
| Mozilla Thunderbird (en-US) | 78.10.0 | Mozilla Thunderbird (en-US) 78.10.0 | Apr 15, 2021 |
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