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Vulnerability details: VCID-k5zh-csjt-pufp
Vulnerability ID VCID-k5zh-csjt-pufp
Aliases CVE-2021-23963
Summary When sharing geolocation during an active WebRTC share, Firefox could have reset the webRTC sharing state in the user interface, leading to loss of control over the currently granted permission
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-281 Improper Preservation of Permissions
System Score Found at
epss 0.0023 https://api.first.org/data/v1/epss?cve=CVE-2021-23963
epss 0.0023 https://api.first.org/data/v1/epss?cve=CVE-2021-23963
epss 0.0023 https://api.first.org/data/v1/epss?cve=CVE-2021-23963
epss 0.0023 https://api.first.org/data/v1/epss?cve=CVE-2021-23963
epss 0.0023 https://api.first.org/data/v1/epss?cve=CVE-2021-23963
epss 0.0023 https://api.first.org/data/v1/epss?cve=CVE-2021-23963
epss 0.0023 https://api.first.org/data/v1/epss?cve=CVE-2021-23963
epss 0.0023 https://api.first.org/data/v1/epss?cve=CVE-2021-23963
epss 0.0023 https://api.first.org/data/v1/epss?cve=CVE-2021-23963
epss 0.0023 https://api.first.org/data/v1/epss?cve=CVE-2021-23963
epss 0.0023 https://api.first.org/data/v1/epss?cve=CVE-2021-23963
epss 0.0023 https://api.first.org/data/v1/epss?cve=CVE-2021-23963
epss 0.0023 https://api.first.org/data/v1/epss?cve=CVE-2021-23963
epss 0.0023 https://api.first.org/data/v1/epss?cve=CVE-2021-23963
epss 0.0023 https://api.first.org/data/v1/epss?cve=CVE-2021-23963
epss 0.0023 https://api.first.org/data/v1/epss?cve=CVE-2021-23963
epss 0.0023 https://api.first.org/data/v1/epss?cve=CVE-2021-23963
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2021-23963
cvssv3.1 4.3 https://nvd.nist.gov/vuln/detail/CVE-2021-23963
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-2021-23963
https://bugzilla.mozilla.org/show_bug.cgi?id=1680793
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-2021-23963 https://nvd.nist.gov/vuln/detail/CVE-2021-23963
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-2021-23963
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:N/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-23963
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 0.45833
EPSS Score 0.0023
Published At Aug. 4, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:50.494381+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2021/mfsa2021-03.yml 37.0.0