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Vulnerability details: VCID-1pcf-75nr-v3b7
Vulnerability ID VCID-1pcf-75nr-v3b7
Aliases CVE-2021-23972
Summary One phishing tactic on the web is to provide a link with HTTP Auth. For example https://www.phishingtarget.com@evil.com. To mitigate this type of attack, Firefox will display a warning dialog; however, this warning dialog would not have been displayed if evil.com used a redirect that was cached by the browser.
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 0.00467 https://api.first.org/data/v1/epss?cve=CVE-2021-23972
epss 0.00467 https://api.first.org/data/v1/epss?cve=CVE-2021-23972
epss 0.00467 https://api.first.org/data/v1/epss?cve=CVE-2021-23972
epss 0.00467 https://api.first.org/data/v1/epss?cve=CVE-2021-23972
epss 0.00467 https://api.first.org/data/v1/epss?cve=CVE-2021-23972
epss 0.00467 https://api.first.org/data/v1/epss?cve=CVE-2021-23972
epss 0.00467 https://api.first.org/data/v1/epss?cve=CVE-2021-23972
epss 0.00467 https://api.first.org/data/v1/epss?cve=CVE-2021-23972
epss 0.00467 https://api.first.org/data/v1/epss?cve=CVE-2021-23972
epss 0.0047 https://api.first.org/data/v1/epss?cve=CVE-2021-23972
epss 0.0047 https://api.first.org/data/v1/epss?cve=CVE-2021-23972
epss 0.0047 https://api.first.org/data/v1/epss?cve=CVE-2021-23972
epss 0.0047 https://api.first.org/data/v1/epss?cve=CVE-2021-23972
epss 0.0047 https://api.first.org/data/v1/epss?cve=CVE-2021-23972
epss 0.0047 https://api.first.org/data/v1/epss?cve=CVE-2021-23972
epss 0.0047 https://api.first.org/data/v1/epss?cve=CVE-2021-23972
epss 0.0047 https://api.first.org/data/v1/epss?cve=CVE-2021-23972
epss 0.0047 https://api.first.org/data/v1/epss?cve=CVE-2021-23972
epss 0.0047 https://api.first.org/data/v1/epss?cve=CVE-2021-23972
epss 0.0047 https://api.first.org/data/v1/epss?cve=CVE-2021-23972
epss 0.0047 https://api.first.org/data/v1/epss?cve=CVE-2021-23972
epss 0.0047 https://api.first.org/data/v1/epss?cve=CVE-2021-23972
epss 0.0047 https://api.first.org/data/v1/epss?cve=CVE-2021-23972
epss 0.0047 https://api.first.org/data/v1/epss?cve=CVE-2021-23972
epss 0.0047 https://api.first.org/data/v1/epss?cve=CVE-2021-23972
epss 0.0047 https://api.first.org/data/v1/epss?cve=CVE-2021-23972
cvssv3.1 8.8 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 6.8 https://nvd.nist.gov/vuln/detail/CVE-2021-23972
cvssv3.1 8.8 https://nvd.nist.gov/vuln/detail/CVE-2021-23972
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-2021-23972
https://bugzilla.mozilla.org/show_bug.cgi?id=1683536
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-2021-23972 https://nvd.nist.gov/vuln/detail/CVE-2021-23972
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: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-2021-23972
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-2021-23972
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 0.63529
EPSS Score 0.00467
Published At Sept. 9, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:48.848585+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2021/mfsa2021-07.yml 37.0.0