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Vulnerability details: VCID-2mzj-tj2x-aaak
Vulnerability ID VCID-2mzj-tj2x-aaak
Aliases CVE-2021-23958
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-668 Exposure of Resource to Wrong Sphere
System Score Found at
generic_textual Medium http://people.canonical.com/~ubuntu-security/cve/2021/CVE-2021-23958.html
epss 0.00146 https://api.first.org/data/v1/epss?cve=CVE-2021-23958
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epss 0.00166 https://api.first.org/data/v1/epss?cve=CVE-2021-23958
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epss 0.00325 https://api.first.org/data/v1/epss?cve=CVE-2021-23958
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epss 0.00325 https://api.first.org/data/v1/epss?cve=CVE-2021-23958
epss 0.00325 https://api.first.org/data/v1/epss?cve=CVE-2021-23958
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epss 0.00325 https://api.first.org/data/v1/epss?cve=CVE-2021-23958
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epss 0.00325 https://api.first.org/data/v1/epss?cve=CVE-2021-23958
epss 0.00325 https://api.first.org/data/v1/epss?cve=CVE-2021-23958
epss 0.00325 https://api.first.org/data/v1/epss?cve=CVE-2021-23958
epss 0.00325 https://api.first.org/data/v1/epss?cve=CVE-2021-23958
epss 0.00912 https://api.first.org/data/v1/epss?cve=CVE-2021-23958
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23958
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2021-23958
cvssv3 6.5 https://nvd.nist.gov/vuln/detail/CVE-2021-23958
cvssv3.1 6.5 https://nvd.nist.gov/vuln/detail/CVE-2021-23958
archlinux High https://security.archlinux.org/AVG-1492
generic_textual Medium https://ubuntu.com/security/notices/USN-4717-1
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2021-03
generic_textual Medium https://www.mozilla.org/en-US/security/advisories/mfsa2021-03/#CVE-2021-23958
Reference id Reference type URL
http://people.canonical.com/~ubuntu-security/cve/2021/CVE-2021-23958.html
https://api.first.org/data/v1/epss?cve=CVE-2021-23958
https://bugzilla.mozilla.org/show_bug.cgi?id=1642747
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23958
https://ubuntu.com/security/notices/USN-4717-1
https://www.mozilla.org/en-US/security/advisories/mfsa2021-03/#CVE-2021-23958
https://www.mozilla.org/security/advisories/mfsa2021-03/
ASA-202102-1 https://security.archlinux.org/ASA-202102-1
AVG-1492 https://security.archlinux.org/AVG-1492
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
CVE-2021-23958 https://nvd.nist.gov/vuln/detail/CVE-2021-23958
GLSA-202102-01 https://security.gentoo.org/glsa/202102-01
mfsa2021-03 https://www.mozilla.org/en-US/security/advisories/mfsa2021-03
USN-4717-1 https://usn.ubuntu.com/4717-1/
No exploits are available.
Vector: AV:N/AC:M/Au:N/C:P/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-23958
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-23958
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-23958
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.51018
EPSS Score 0.00146
Published At Dec. 17, 2024, midnight
Date Actor Action Source VulnerableCode Version
There are no relevant records.