Critical severity · published Dec 22, 2022
CVE-2021-4140
It was possible to construct specific XSLT markup that would be able to bypass an iframe sandbox
10.0
CVSS
1.4%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)1.4% · higher than 72% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FI
Firefox · Mozilla
before 96.0 · source: NVD
FE
Firefox Esr · Mozilla
before 91.5 · source: NVD
TH
Thunderbird · Mozilla
before 91.5 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-4140
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-4140
Exploit
https://bugzilla.mozilla.org/show_bug.cgi?id=1746720
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2022-01/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2022-02/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2022-03/
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