Vulnerability Details : CVE-2021-23984
A malicious extension could have opened a popup window lacking an address bar. The title of the popup lacking an address bar should not be fully controllable, but in this situation was. This could have been used to spoof a website and attempt to trick the user into providing credentials. This vulnerability affects Firefox ESR < 78.9, Firefox < 87, and Thunderbird < 78.9.
Products affected by CVE-2021-23984
- 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-2021-23984
0.17%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 54 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-23984
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.3
|
MEDIUM | AV:N/AC:M/Au:N/C:N/I:P/A:N |
8.6
|
2.9
|
NIST | |
|
6.5
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N |
2.8
|
3.6
|
NIST |
CWE ids for CVE-2021-23984
-
This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-23984
-
https://bugzilla.mozilla.org/show_bug.cgi?id=1693664
Access DeniedIssue Tracking;Vendor Advisory
-
https://www.mozilla.org/security/advisories/mfsa2021-12/
Security Vulnerabilities fixed in Thunderbird 78.9 — MozillaVendor Advisory
-
https://www.mozilla.org/security/advisories/mfsa2021-11/
Security Vulnerabilities fixed in Firefox ESR 78.9 — MozillaVendor Advisory
-
https://www.mozilla.org/security/advisories/mfsa2021-10/
Security Vulnerabilities fixed in Firefox 87 — MozillaVendor Advisory
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