Security Advisory

CVE-2020-26961

CVE vulnerability detail — eXtreme Datacenter Security Operations

Published 2020-12-09 00:23:31

Last updated 2024-08-04 16:03:23

Assigner mozilla

State PUBLISHED

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.

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