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CVE-2020-26961

Date: December 8, 2020

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.

Severity Score

Related Resources (10)

https://www.mozilla.org/security/advisories/mfsa2020-52/
https://www.mozilla.org/security/advisories/mfsa2020-51/
https://www.mozilla.org/security/advisories/mfsa2020-50/
https://nvd.nist.gov/vuln/detail/CVE-2020-26961
https://bugzilla.mozilla.org/show_bug.cgi?id=1672528
https://access.redhat.com/security/cve/CVE-2020-26961
https://security-tracker.debian.org/tracker/CVE-2020-26961
https://people.canonical.com/~ubuntu-security/cve/CVE-2020-26961
https://security.alpinelinux.org/vuln/CVE-2020-26961
https://www.mend.io/vulnerability-database/CVE-2020-26961

Severity Score

Weakness Type (CWE)

Insufficient Information

NVD-CWE-noinfo

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): REQUIRED
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): HIGH
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): PARTIAL
Availability (A): NONE
Additional information:

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