CVE-2021-4321

Public Exploit

Description

Policy bypass in Blink in Google Chrome prior to 91.0.4472.77 allowed a remote attacker to bypass content security policy via a crafted HTML page. (Chromium security severity: Low)

4.3

CVSS

Severity: Medium

CVSS 3.1 •

EPSS 0.11%

Vendor Advisory googleblog.com Vendor Advisory crbug.com

Affected: Google Chrome

References

Link	Tags
https://chromereleases.googleblog.com/2021/05/stable-channel-update-for-desktop_25.html	release notes vendor advisory
https://crbug.com/1161891	vendor advisory issue tracking exploit
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PQKT7EGDD2P3L7S3NXEDDRCPK4NNZNWJ/

Frequently Asked Questions

What is the severity of CVE-2021-4321?: CVE-2021-4321 has been scored as a medium severity vulnerability.
How to fix CVE-2021-4321?: To fix CVE-2021-4321, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-4321 being actively exploited in the wild?: It is possible that CVE-2021-4321 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-4321?: CVE-2021-4321 affects Google Chrome.

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