CVE-2020-26961
Medium
Description
When DNS over HTTPS is in use, it intentionally filters RFC1918 and related IP ranges from the responses as these do not make sense coming from a DoH resolver. However when an IPv4 address was mapped through IPv6, these addresses were erroneously let through, leading to a potential DNS Rebinding attack. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.
SeverityMedium
CVSS6.5
Exploit probability—
Product
Mozilla Firefox
PublishedDec 9, 2020
First seenDec 9, 2020
How to fix
Update
- mozilla firefox83.0 or later
- mozilla firefox_esr78.5 or later
- mozilla thunderbird78.5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mozilla firefox | v < 83.0 | 83.0 |
| mozilla firefox_esr | v < 78.5 | 78.5 |
| mozilla thunderbird | v < 78.5 | 78.5 |
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