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ubuntucveUbuntu.comUB:CVE-2021-23958
HistoryJan 26, 2021 - 12:00 a.m.

CVE-2021-23958

2021-01-2600:00:00
ubuntu.com
ubuntu.com
13
browser security
screen sharing
information leakage
firefox vulnerability

CVSS2

4.3

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

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

CVSS3

6.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

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

EPSS

0.002

Percentile

53.4%

The browser could have been confused into transferring a screen sharing
state into another tab, which would leak unintended information. This
vulnerability affects Firefox < 85.

Notes

Author Note
tyhicks mozjs contains a copy of the SpiderMonkey JavaScript engine
OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchfirefox< 85.0+build1-0ubuntu0.18.04.1UNKNOWN
ubuntu20.04noarchfirefox< 85.0+build1-0ubuntu0.20.04.1UNKNOWN
ubuntu20.10noarchfirefox< 85.0+build1-0ubuntu0.20.10.1UNKNOWN
ubuntu21.04noarchfirefox< 85.0+build1-0ubuntu1UNKNOWN
ubuntu21.10noarchfirefox< 85.0+build1-0ubuntu1UNKNOWN
ubuntu22.04noarchfirefox< 85.0+build1-0ubuntu1UNKNOWN
ubuntu22.10noarchfirefox< 85.0+build1-0ubuntu1UNKNOWN
ubuntu23.04noarchfirefox< 85.0+build1-0ubuntu1UNKNOWN
ubuntu23.10noarchfirefox< 85.0+build1-0ubuntu1UNKNOWN
ubuntu24.04noarchfirefox< 85.0+build1-0ubuntu1UNKNOWN
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CVSS2

4.3

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

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

CVSS3

6.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

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

EPSS

0.002

Percentile

53.4%