AUGUST 4, 2026
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Case File

CVE-2020-26961

MEDIUM · CVSS 6.5 EPSS 1.15%

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2020-12-09 · Last synced 2026-08-04

CyberRota Analysis

AI analysis pending.

CVE
CVE-2020-26961
Severity
MEDIUM
CVSS
6.5
EPSS
1.15%
Firefox

Original NVD 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.