Vulnerability 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 Score
10.0
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 96.0 |
| Mozilla | Firefox Esr | < 91.5 |
| Mozilla | Thunderbird | < 91.5 |
Related Weaknesses (CWE)
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1746720ExploitIssue TrackingPatch
- 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/Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1746720ExploitIssue TrackingPatch
- 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/Vendor Advisory
FAQ
What is CVE-2021-4140?
CVE-2021-4140 is a vulnerability with a CVSS score of 10.0 (CRITICAL). 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.
How severe is CVE-2021-4140?
CVE-2021-4140 has been rated CRITICAL with a CVSS base score of 10.0/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2021-4140?
Check the references section above for vendor advisories and patch information. Affected products include: Mozilla Firefox, Mozilla Firefox Esr, Mozilla Thunderbird.