| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 83.0 | 83.0 |
| firefox esr | < 78.5 | 78.5 |
| thunderbird | < 78.5 | 78.5 |
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.
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