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ubuntucveUbuntu.comUB:CVE-2021-38492
HistoryNov 03, 2021 - 12:00 a.m.

CVE-2021-38492

2021-11-0300:00:00
ubuntu.com
ubuntu.com
14
firefox
cve-2021-38492
mk scheme
internet explorer
unprivileged mode
windows

CVSS2

4.3

Attack Vector

NETWORK

Attack 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

CVSS3

6.5

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

EPSS

0.003

Percentile

70.0%

When delegating navigations to the operating system, Firefox would accept
the mk scheme which might allow attackers to launch pages and execute
scripts in Internet Explorer in unprivileged mode. This bug only affects
Firefox for Windows. Other operating systems are unaffected.
. This
vulnerability affects Firefox < 92, Thunderbird < 91.1, Thunderbird <
78.14, Firefox ESR < 78.14, and Firefox ESR < 91.1.

Notes

Author Note
tyhicks mozjs contains a copy of the SpiderMonkey JavaScript engine

CVSS2

4.3

Attack Vector

NETWORK

Attack 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

CVSS3

6.5

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

EPSS

0.003

Percentile

70.0%