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ubuntucveUbuntu.comUB:CVE-2020-26961
HistoryNov 17, 2020 - 12:00 a.m.

CVE-2020-26961

2020-11-1700:00:00
ubuntu.com
ubuntu.com
17

6.5 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

4.3 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:M/Au:N/C:N/I:P/A:N

0.001 Low

EPSS

Percentile

46.6%

JSON

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.

Notes

Author Note
tyhicks mozjs contains a copy of the SpiderMonkey JavaScript engine
OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchfirefox< 83.0+build2-0ubuntu0.18.04.2UNKNOWN
ubuntu20.04noarchfirefox< 83.0+build2-0ubuntu0.20.04.1UNKNOWN
ubuntu20.10noarchfirefox< 83.0+build2-0ubuntu0.20.10.1UNKNOWN
ubuntu21.04noarchfirefox< 83.0+build2-0ubuntu1UNKNOWN
ubuntu21.10noarchfirefox< 83.0+build2-0ubuntu1UNKNOWN
ubuntu22.04noarchfirefox< 83.0+build2-0ubuntu1UNKNOWN
ubuntu22.10noarchfirefox< 83.0+build2-0ubuntu1UNKNOWN
ubuntu23.04noarchfirefox< 83.0+build2-0ubuntu1UNKNOWN
ubuntu23.10noarchfirefox< 83.0+build2-0ubuntu1UNKNOWN
ubuntu24.04noarchfirefox< 83.0+build2-0ubuntu1UNKNOWN
Rows per page:
1-10 of 251

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6.5 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

4.3 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:M/Au:N/C:N/I:P/A:N

0.001 Low

EPSS

Percentile

46.6%

JSON
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