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Vulnerability details: VCID-28mx-ktwr-mubm
Vulnerability ID VCID-28mx-ktwr-mubm
Aliases CVE-2021-23955
Summary The browser could have been confused into transferring a pointer lock state into another tab, which could have lead to clickjacking attacks.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-1021 Improper Restriction of Rendered UI Layers or Frames
System Score Found at
epss 0.00238 https://api.first.org/data/v1/epss?cve=CVE-2021-23955
epss 0.00238 https://api.first.org/data/v1/epss?cve=CVE-2021-23955
epss 0.00238 https://api.first.org/data/v1/epss?cve=CVE-2021-23955
epss 0.00238 https://api.first.org/data/v1/epss?cve=CVE-2021-23955
epss 0.00238 https://api.first.org/data/v1/epss?cve=CVE-2021-23955
epss 0.00238 https://api.first.org/data/v1/epss?cve=CVE-2021-23955
epss 0.00238 https://api.first.org/data/v1/epss?cve=CVE-2021-23955
epss 0.00238 https://api.first.org/data/v1/epss?cve=CVE-2021-23955
epss 0.00238 https://api.first.org/data/v1/epss?cve=CVE-2021-23955
epss 0.00238 https://api.first.org/data/v1/epss?cve=CVE-2021-23955
epss 0.00238 https://api.first.org/data/v1/epss?cve=CVE-2021-23955
epss 0.00238 https://api.first.org/data/v1/epss?cve=CVE-2021-23955
epss 0.00238 https://api.first.org/data/v1/epss?cve=CVE-2021-23955
epss 0.00238 https://api.first.org/data/v1/epss?cve=CVE-2021-23955
epss 0.00238 https://api.first.org/data/v1/epss?cve=CVE-2021-23955
epss 0.00238 https://api.first.org/data/v1/epss?cve=CVE-2021-23955
epss 0.00238 https://api.first.org/data/v1/epss?cve=CVE-2021-23955
epss 0.00238 https://api.first.org/data/v1/epss?cve=CVE-2021-23955
epss 0.00238 https://api.first.org/data/v1/epss?cve=CVE-2021-23955
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2021-23955
cvssv3.1 6.1 https://nvd.nist.gov/vuln/detail/CVE-2021-23955
archlinux High https://security.archlinux.org/AVG-1492
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2021-03
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-23955
https://bugzilla.mozilla.org/show_bug.cgi?id=1684837
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-2021-23955 https://nvd.nist.gov/vuln/detail/CVE-2021-23955
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:N/I:P/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-23955
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:C/C:L/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-23955
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 0.46928
EPSS Score 0.00238
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:50.342991+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2021/mfsa2021-03.yml 37.0.0