CVE-2020-26961

CVE Details

Release Date:	2020-12-09
Impact:	None	What is this?

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.

See more information about CVE-2020-26961 from MITRE CVE dictionary and NIST NVD

NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 metrics

Base Score:	6.5
Vector String:	CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Version:	3.0
Attack Vector:	Network
Attack Complexity:	Low
Privileges Required:	None
User Interaction:	Required
Scope:	Unchanged
Confidentiality Impact:	None
Integrity Impact:	High
Availability Impact:	None

Errata information

Platform	Errata	Release Date
Oracle Linux version 6 (firefox)	ELSA-2020-5257	2020-12-01
Oracle Linux version 6 (thunderbird)	ELSA-2020-5238	2020-12-01
Oracle Linux version 7 (firefox)	ELSA-2020-5239	2020-12-01
Oracle Linux version 7 (thunderbird)	ELSA-2020-5235	2020-12-01
Oracle Linux version 8 (firefox)	ELSA-2020-5237	2020-12-01
Oracle Linux version 8 (thunderbird)	ELSA-2020-5236	2020-12-01