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Vulnerability details: VCID-j4au-z3br-aaae
Vulnerability ID VCID-j4au-z3br-aaae
Aliases CVE-2021-43540
Summary WebExtensions with the correct permissions were able to create and install ServiceWorkers for third-party websites that would not have been uninstalled with the extension. This vulnerability affects Firefox < 95.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (0)
There are no known CWE.
System Score Found at
epss 0.00086 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00086 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00086 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00086 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00109 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00109 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00109 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00109 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00109 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00109 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00109 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00109 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00109 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00109 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00109 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00109 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00304 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00304 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00304 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00304 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00304 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00304 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00304 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00304 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00304 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00304 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00304 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00304 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00304 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00364 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
epss 0.00818 https://api.first.org/data/v1/epss?cve=CVE-2021-43540
cvssv3.1 6.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2021-43540
cvssv3 6.5 https://nvd.nist.gov/vuln/detail/CVE-2021-43540
cvssv3.1 6.5 https://nvd.nist.gov/vuln/detail/CVE-2021-43540
archlinux High https://security.archlinux.org/AVG-2606
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2021-52
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-43540
https://bugzilla.mozilla.org/show_bug.cgi?id=1636629
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://security.gentoo.org/glsa/202202-03
https://www.mozilla.org/security/advisories/mfsa2021-52/
ASA-202112-8 https://security.archlinux.org/ASA-202112-8
AVG-2606 https://security.archlinux.org/AVG-2606
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-2021-43540 https://nvd.nist.gov/vuln/detail/CVE-2021-43540
mfsa2021-52 https://www.mozilla.org/en-US/security/advisories/mfsa2021-52
USN-5186-1 https://usn.ubuntu.com/5186-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
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: AV:N/AC:M/Au:N/C:N/I:P/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-43540
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:H/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-43540
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:N/I:H/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-43540
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 0.38390
EPSS Score 0.00086
Published At Dec. 17, 2024, midnight
Date Actor Action Source VulnerableCode Version
There are no relevant records.