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Vulnerability details: VCID-unbt-buxd-8yea
Vulnerability ID VCID-unbt-buxd-8yea
Aliases CVE-2021-4140
Summary It was possible to construct specific XSLT markup that would be able to bypass an iframe sandbox.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-1021 Improper Restriction of Rendered UI Layers or Frames
CWE-91 XML Injection (aka Blind XPath Injection)
System Score Found at
cvssv3 9.6 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-4140.json
epss 0.00049 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
epss 0.00053 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
epss 0.00053 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
epss 0.00053 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
epss 0.00053 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
epss 0.00053 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
epss 0.00053 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
epss 0.00053 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
epss 0.00053 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
epss 0.00053 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
epss 0.00053 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
epss 0.00053 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
epss 0.00053 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
epss 0.00053 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
epss 0.00053 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
epss 0.00053 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
epss 0.00053 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
cvssv3.1 9.8 https://bugzilla.mozilla.org/show_bug.cgi?id=1746720
ssvc Track* https://bugzilla.mozilla.org/show_bug.cgi?id=1746720
cvssv3.1 10.0 https://nvd.nist.gov/vuln/detail/CVE-2021-4140
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2022-01
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2022-02
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2022-03
cvssv3.1 9.8 https://www.mozilla.org/security/advisories/mfsa2022-01/
ssvc Track* https://www.mozilla.org/security/advisories/mfsa2022-01/
cvssv3.1 9.8 https://www.mozilla.org/security/advisories/mfsa2022-02/
ssvc Track* https://www.mozilla.org/security/advisories/mfsa2022-02/
cvssv3.1 9.8 https://www.mozilla.org/security/advisories/mfsa2022-03/
ssvc Track* https://www.mozilla.org/security/advisories/mfsa2022-03/
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-4140.json
https://api.first.org/data/v1/epss?cve=CVE-2021-4140
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-4140
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22737
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22738
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22739
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22740
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22741
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22742
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22743
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22745
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22747
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22748
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-22751
2039568 https://bugzilla.redhat.com/show_bug.cgi?id=2039568
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-2021-4140 https://nvd.nist.gov/vuln/detail/CVE-2021-4140
mfsa2022-01 https://www.mozilla.org/en-US/security/advisories/mfsa2022-01
mfsa2022-01 https://www.mozilla.org/security/advisories/mfsa2022-01/
mfsa2022-02 https://www.mozilla.org/en-US/security/advisories/mfsa2022-02
mfsa2022-02 https://www.mozilla.org/security/advisories/mfsa2022-02/
mfsa2022-03 https://www.mozilla.org/en-US/security/advisories/mfsa2022-03
mfsa2022-03 https://www.mozilla.org/security/advisories/mfsa2022-03/
RHSA-2022:0123 https://access.redhat.com/errata/RHSA-2022:0123
RHSA-2022:0124 https://access.redhat.com/errata/RHSA-2022:0124
RHSA-2022:0125 https://access.redhat.com/errata/RHSA-2022:0125
RHSA-2022:0126 https://access.redhat.com/errata/RHSA-2022:0126
RHSA-2022:0127 https://access.redhat.com/errata/RHSA-2022:0127
RHSA-2022:0128 https://access.redhat.com/errata/RHSA-2022:0128
RHSA-2022:0129 https://access.redhat.com/errata/RHSA-2022:0129
RHSA-2022:0130 https://access.redhat.com/errata/RHSA-2022:0130
RHSA-2022:0131 https://access.redhat.com/errata/RHSA-2022:0131
RHSA-2022:0132 https://access.redhat.com/errata/RHSA-2022:0132
show_bug.cgi?id=1746720 https://bugzilla.mozilla.org/show_bug.cgi?id=1746720
USN-5229-1 https://usn.ubuntu.com/5229-1/
USN-5246-1 https://usn.ubuntu.com/5246-1/
USN-5248-1 https://usn.ubuntu.com/5248-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-4140.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:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://bugzilla.mozilla.org/show_bug.cgi?id=1746720
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: SSVCv2/E:P/A:Y/T:T/P:M/B:A/M:M/D:R/2025-04-16T15:55:14Z/ Found at https://bugzilla.mozilla.org/show_bug.cgi?id=1746720
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-4140
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:N/S:U/C:H/I:H/A:H Found at https://www.mozilla.org/security/advisories/mfsa2022-01/
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: SSVCv2/E:P/A:Y/T:T/P:M/B:A/M:M/D:R/2025-04-16T15:55:14Z/ Found at https://www.mozilla.org/security/advisories/mfsa2022-01/
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://www.mozilla.org/security/advisories/mfsa2022-02/
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: SSVCv2/E:P/A:Y/T:T/P:M/B:A/M:M/D:R/2025-04-16T15:55:14Z/ Found at https://www.mozilla.org/security/advisories/mfsa2022-02/
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://www.mozilla.org/security/advisories/mfsa2022-03/
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: SSVCv2/E:P/A:Y/T:T/P:M/B:A/M:M/D:R/2025-04-16T15:55:14Z/ Found at https://www.mozilla.org/security/advisories/mfsa2022-03/
Exploit Prediction Scoring System (EPSS)
Percentile 0.14798
EPSS Score 0.00049
Published At Aug. 16, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:10:08.246884+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2022/mfsa2022-01.yml 37.0.0