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Vulnerability details: VCID-ay7a-cam5-aaah
Vulnerability ID VCID-ay7a-cam5-aaah
Aliases CVE-2021-4140
Summary It was possible to construct specific XSLT markup that would be able to bypass an iframe sandbox. This vulnerability affects Firefox ESR < 91.5, Firefox < 96, and Thunderbird < 91.5.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-91 XML Injection (aka Blind XPath Injection)
CWE-1021 Improper Restriction of Rendered UI Layers or Frames
System Score Found at
rhas Important https://access.redhat.com/errata/RHSA-2022:0123
rhas Important https://access.redhat.com/errata/RHSA-2022:0124
rhas Important https://access.redhat.com/errata/RHSA-2022:0125
rhas Important https://access.redhat.com/errata/RHSA-2022:0126
rhas Important https://access.redhat.com/errata/RHSA-2022:0127
rhas Important https://access.redhat.com/errata/RHSA-2022:0128
rhas Important https://access.redhat.com/errata/RHSA-2022:0129
rhas Important https://access.redhat.com/errata/RHSA-2022:0130
rhas Important https://access.redhat.com/errata/RHSA-2022:0131
rhas Important https://access.redhat.com/errata/RHSA-2022:0132
cvssv3 9.6 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-4140.json
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epss 0.00069 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
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epss 0.00069 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
epss 0.00069 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
epss 0.00069 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
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epss 0.00069 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
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epss 0.00069 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
epss 0.00069 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
epss 0.00069 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
epss 0.00069 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
epss 0.00069 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
epss 0.00069 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
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epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2021-4140
epss 0.00286 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
rhbs high https://bugzilla.redhat.com/show_bug.cgi?id=2039568
cvssv3 10.0 https://nvd.nist.gov/vuln/detail/CVE-2021-4140
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://bugzilla.mozilla.org/show_bug.cgi?id=1746720
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
https://www.mozilla.org/security/advisories/mfsa2022-01/
https://www.mozilla.org/security/advisories/mfsa2022-02/
https://www.mozilla.org/security/advisories/mfsa2022-03/
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
mfsa2022-02 https://www.mozilla.org/en-US/security/advisories/mfsa2022-02
mfsa2022-03 https://www.mozilla.org/en-US/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
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: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 0.15978
EPSS Score 0.00051
Published At June 20, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
There are no relevant records.