Vulnerability Details : CVE-2021-4140
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.
Products affected by CVE-2021-4140
- cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-4140
0.25%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 66 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-4140
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
10.0
|
CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
3.9
|
6.0
|
NIST |
CWE ids for CVE-2021-4140
-
The product does not properly neutralize special elements that are used in XML, allowing attackers to modify the syntax, content, or commands of the XML before it is processed by an end system.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-4140
-
https://www.mozilla.org/security/advisories/mfsa2022-01/
Security Vulnerabilities fixed in Firefox 96 — MozillaVendor Advisory
-
https://www.mozilla.org/security/advisories/mfsa2022-02/
Security Vulnerabilities fixed in Firefox ESR 91.5 — MozillaVendor Advisory
-
https://www.mozilla.org/security/advisories/mfsa2022-03/
Security Vulnerabilities fixed in Thunderbird 91.5 — MozillaVendor Advisory
-
https://bugzilla.mozilla.org/show_bug.cgi?id=1746720
1746720 - (CVE-2021-4140) Meta refresh via XSLT stylesheet bypasses <iframe sandbox> attribute restrictionsExploit;Issue Tracking;Patch;Vendor Advisory
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