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Vulnerability details: VCID-r7du-vrqu-aaak
Vulnerability ID VCID-r7du-vrqu-aaak
Aliases CVE-2021-23954
Summary Using the new logical assignment operators in a JavaScript switch statement could have caused a type confusion, leading to a memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 85, Thunderbird < 78.7, and Firefox ESR < 78.7.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-843 Access of Resource Using Incompatible Type ('Type Confusion')
System Score Found at
generic_textual Medium http://people.canonical.com/~ubuntu-security/cve/2021/CVE-2021-23954.html
rhas Important https://access.redhat.com/errata/RHSA-2021:0285
rhas Important https://access.redhat.com/errata/RHSA-2021:0288
rhas Important https://access.redhat.com/errata/RHSA-2021:0289
rhas Important https://access.redhat.com/errata/RHSA-2021:0290
rhas Important https://access.redhat.com/errata/RHSA-2021:0297
rhas Important https://access.redhat.com/errata/RHSA-2021:0298
rhas Important https://access.redhat.com/errata/RHSA-2021:0299
rhas Important https://access.redhat.com/errata/RHSA-2021:0397
cvssv3 8.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-23954.json
epss 0.00255 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00255 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00255 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00255 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00255 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00255 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00255 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00255 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00255 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00255 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00255 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00255 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00279 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
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epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
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epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00302 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00317 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00317 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.00317 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
epss 0.009 https://api.first.org/data/v1/epss?cve=CVE-2021-23954
rhbs high https://bugzilla.redhat.com/show_bug.cgi?id=1920648
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15685
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-16044
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26976
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23953
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23954
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23960
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23964
cvssv3.1 7.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 6.8 https://nvd.nist.gov/vuln/detail/CVE-2021-23954
cvssv3 8.8 https://nvd.nist.gov/vuln/detail/CVE-2021-23954
cvssv3.1 8.8 https://nvd.nist.gov/vuln/detail/CVE-2021-23954
archlinux High https://security.archlinux.org/AVG-1492
archlinux High https://security.archlinux.org/AVG-1496
generic_textual Medium https://ubuntu.com/security/notices/USN-4717-1
generic_textual Medium https://ubuntu.com/security/notices/USN-4736-1
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-2021-23954
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2021-04
generic_textual Medium https://www.mozilla.org/en-US/security/advisories/mfsa2021-04/#CVE-2021-23954
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2021-05
Reference id Reference type URL
http://people.canonical.com/~ubuntu-security/cve/2021/CVE-2021-23954.html
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-23954.json
https://api.first.org/data/v1/epss?cve=CVE-2021-23954
https://bugzilla.mozilla.org/show_bug.cgi?id=1684020
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15685
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-16044
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26976
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23953
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23954
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23960
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23964
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://ubuntu.com/security/notices/USN-4717-1
https://ubuntu.com/security/notices/USN-4736-1
https://www.mozilla.org/en-US/security/advisories/mfsa2021-03/#CVE-2021-23954
https://www.mozilla.org/en-US/security/advisories/mfsa2021-04/#CVE-2021-23954
https://www.mozilla.org/security/advisories/mfsa2021-03/
https://www.mozilla.org/security/advisories/mfsa2021-04/
https://www.mozilla.org/security/advisories/mfsa2021-05/
1920648 https://bugzilla.redhat.com/show_bug.cgi?id=1920648
ASA-202102-1 https://security.archlinux.org/ASA-202102-1
ASA-202102-2 https://security.archlinux.org/ASA-202102-2
AVG-1492 https://security.archlinux.org/AVG-1492
AVG-1496 https://security.archlinux.org/AVG-1496
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:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
CVE-2021-23954 https://nvd.nist.gov/vuln/detail/CVE-2021-23954
GLSA-202102-01 https://security.gentoo.org/glsa/202102-01
mfsa2021-03 https://www.mozilla.org/en-US/security/advisories/mfsa2021-03
mfsa2021-04 https://www.mozilla.org/en-US/security/advisories/mfsa2021-04
mfsa2021-05 https://www.mozilla.org/en-US/security/advisories/mfsa2021-05
RHSA-2021:0285 https://access.redhat.com/errata/RHSA-2021:0285
RHSA-2021:0288 https://access.redhat.com/errata/RHSA-2021:0288
RHSA-2021:0289 https://access.redhat.com/errata/RHSA-2021:0289
RHSA-2021:0290 https://access.redhat.com/errata/RHSA-2021:0290
RHSA-2021:0297 https://access.redhat.com/errata/RHSA-2021:0297
RHSA-2021:0298 https://access.redhat.com/errata/RHSA-2021:0298
RHSA-2021:0299 https://access.redhat.com/errata/RHSA-2021:0299
RHSA-2021:0397 https://access.redhat.com/errata/RHSA-2021:0397
USN-4717-1 https://usn.ubuntu.com/4717-1/
USN-4736-1 https://usn.ubuntu.com/4736-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-23954.json
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:H/PR:N/UI:R/S:U/C:H/I:H/A:H 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:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2021-23954
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:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-23954
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:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-23954
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 0.65815
EPSS Score 0.00255
Published At Nov. 1, 2024, midnight
Date Actor Action Source VulnerableCode Version
There are no relevant records.