CVE-2021-21139
MediumPublic PoC
Published: 09 February 2021
Published
09 February 2021
Modified
21 November 2024
KEV Added
—
Patch
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CVSS Score v3.1
6.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
EPSS Score
0.0497
89.9th percentile
Risk Priority
16
60% EPSS · 20% KEV · 20% CVSS
Summary
CVE-2021-21139 is a medium-severity Improper Restriction of Rendered UI Layers or Frames (CWE-1021) vulnerability in Google Chrome. Its CVSS base score is 6.5 (Medium).
Operationally, ranked in the top 10.1% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2021-8530
Vulnerability details
Inappropriate implementation in iframe sandbox in Google Chrome prior to 88.0.4324.96 allowed a remote attacker to bypass navigation restrictions via a crafted HTML page.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
google
chrome
≤ 88.0.4324.96
microsoft
edge chromium
≤ 88.0.705.50
Mitigating Controls
No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.