CVE-2021-21126

moderate-risk
Published 2021-02-09

Insufficient policy enforcement in extensions in Google Chrome prior to 88.0.4324.96 allowed a remote attacker to bypass site isolation via a crafted Chrome Extension.

Do I need to act?

!
10.0% chance of exploitation in next 30 days
EPSS score — higher than 90% of all CVEs
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
6
CVSS 6.5/10 Medium
NETWORK / LOW complexity

Affected Products (2)

Affected Vendors

Microsoft Google

References (6)

Release Notes https://chromereleases.googleblog.com/2021/01/stable-channel-update-for-desktop_...
Permissions Required https://crbug.com/1108126
Third Party Advisory https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-21126
Release Notes https://chromereleases.googleblog.com/2021/01/stable-channel-update-for-desktop_...
Permissions Required https://crbug.com/1108126
Third Party Advisory https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-21126
42
/ 100
moderate-risk
Severity 24/34 · High
Exploitability 11/34 · Low
Exposure 7/34 · Low