Cyber Resilience

CVE-2021-21111

Critical

Published: 08 January 2021

Published
08 January 2021
Modified
21 November 2024
KEV Added
—
Patch
—
CVSS Score v3.1 9.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
EPSS Score 0.0045 64.2th percentile
Risk Priority 19 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-21111 is a critical-severity Improper Restriction of Rendered UI Layers or Frames (CWE-1021) vulnerability in Fedoraproject Fedora. Its CVSS base score is 9.6 (Critical).

Operationally, ranked in the top 35.8% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

Insufficient policy enforcement in WebUI in Google Chrome prior to 87.0.4280.141 allowed an attacker who convinced a user to install a malicious extension to potentially perform a sandbox escape via a crafted Chrome Extension.

CWE(s)
CWE-1021

Related Threats

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

Affected Assets

google
chrome
≤ 87.0.4280.141
fedoraproject
fedora
32, 33
debian
debian linux
10.0

Mitigating Controls

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

References