Cyber Resilience

CVE-2021-38506

Medium

Published: 08 December 2021

Published
08 December 2021
Modified
21 November 2024
KEV Added
—
Patch
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CVSS Score v3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
EPSS Score 0.0086 75.5th percentile
Risk Priority 9 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-38506 is a medium-severity Improper Restriction of Rendered UI Layers or Frames (CWE-1021) vulnerability in Debian Debian Linux. Its CVSS base score is 4.3 (Medium).

Operationally, ranked in the top 24.5% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

Through a series of navigations, Firefox could have entered fullscreen mode without notification or warning to the user. This could lead to spoofing attacks on the browser UI including phishing. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and…

more

Firefox ESR < 91.3.

CWE(s)
CWE-1021

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

mozilla
firefox
≤ 94.0
mozilla
firefox esr
≤ 91.3.0
mozilla
thunderbird
≤ 91.3.0
debian
debian linux
10.0, 11.0, 9.0

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References