CVE-2020-26961

MEDIUM Year: 2020
CVSS v3 Score
6.5
Medium
CVSS v2 Score
4.3
Medium
Weakness Type
NVD-CWE-Other
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Vulnerability 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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