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Vulnerability details: VCID-td48-8tdn-ubbt
Vulnerability ID VCID-td48-8tdn-ubbt
Aliases CVE-2021-23974
Summary The DOMParser API did not properly process <noscript> elements for escaping. This could be used as an mXSS vector to bypass an HTML Sanitizer.
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 0.00142 https://api.first.org/data/v1/epss?cve=CVE-2021-23974
epss 0.00142 https://api.first.org/data/v1/epss?cve=CVE-2021-23974
epss 0.00142 https://api.first.org/data/v1/epss?cve=CVE-2021-23974
epss 0.00142 https://api.first.org/data/v1/epss?cve=CVE-2021-23974
epss 0.00142 https://api.first.org/data/v1/epss?cve=CVE-2021-23974
epss 0.00142 https://api.first.org/data/v1/epss?cve=CVE-2021-23974
epss 0.00142 https://api.first.org/data/v1/epss?cve=CVE-2021-23974
epss 0.00142 https://api.first.org/data/v1/epss?cve=CVE-2021-23974
epss 0.00142 https://api.first.org/data/v1/epss?cve=CVE-2021-23974
epss 0.00142 https://api.first.org/data/v1/epss?cve=CVE-2021-23974
epss 0.00142 https://api.first.org/data/v1/epss?cve=CVE-2021-23974
epss 0.00142 https://api.first.org/data/v1/epss?cve=CVE-2021-23974
epss 0.00142 https://api.first.org/data/v1/epss?cve=CVE-2021-23974
epss 0.00142 https://api.first.org/data/v1/epss?cve=CVE-2021-23974
epss 0.00142 https://api.first.org/data/v1/epss?cve=CVE-2021-23974
epss 0.00142 https://api.first.org/data/v1/epss?cve=CVE-2021-23974
epss 0.00142 https://api.first.org/data/v1/epss?cve=CVE-2021-23974
epss 0.00142 https://api.first.org/data/v1/epss?cve=CVE-2021-23974
epss 0.00142 https://api.first.org/data/v1/epss?cve=CVE-2021-23974
epss 0.00142 https://api.first.org/data/v1/epss?cve=CVE-2021-23974
epss 0.00142 https://api.first.org/data/v1/epss?cve=CVE-2021-23974
epss 0.00142 https://api.first.org/data/v1/epss?cve=CVE-2021-23974
epss 0.00142 https://api.first.org/data/v1/epss?cve=CVE-2021-23974
epss 0.00142 https://api.first.org/data/v1/epss?cve=CVE-2021-23974
epss 0.00142 https://api.first.org/data/v1/epss?cve=CVE-2021-23974
epss 0.00142 https://api.first.org/data/v1/epss?cve=CVE-2021-23974
epss 0.00142 https://api.first.org/data/v1/epss?cve=CVE-2021-23974
epss 0.00142 https://api.first.org/data/v1/epss?cve=CVE-2021-23974
cvssv3.1 6.1 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2021-23974
cvssv3.1 6.1 https://nvd.nist.gov/vuln/detail/CVE-2021-23974
archlinux High https://security.archlinux.org/AVG-1599
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2021-07
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-23974
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1528997%2C1683627
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://security.gentoo.org/glsa/202104-10
https://www.mozilla.org/security/advisories/mfsa2021-07/
AVG-1599 https://security.archlinux.org/AVG-1599
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-2021-23974 https://nvd.nist.gov/vuln/detail/CVE-2021-23974
mfsa2021-07 https://www.mozilla.org/en-US/security/advisories/mfsa2021-07
USN-4756-1 https://usn.ubuntu.com/4756-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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-2021-23974
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-2021-23974
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 0.35192
EPSS Score 0.00142
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:48.767826+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2021/mfsa2021-07.yml 37.0.0