CVE-2021-23984

EPSS 1.1%

Vexday Risk Score

3Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS —EPSS 1.1%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

31 Mar 2021Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

Affected products

Mozilla · Firefox Mozilla · Firefox ESR Mozilla · Thunderbird

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References

https://bugzilla.mozilla.org/show_bug.cgi?id=1693664 https://www.mozilla.org/security/advisories/mfsa2021-10/https://www.mozilla.org/security/advisories/mfsa2021-11/https://www.mozilla.org/security/advisories/mfsa2021-12/