CVE-2021-30538

Name: CVE-2021-30538
Creator: NVD / NIST
Published: 2021-06-07T20:15:08.863+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 15.73%

Last modified Jun 17, 2026

CVE-2021-30538 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. Insufficient policy enforcement in content security policy in Google Chrome prior to 91.0.4472.77 allowed a remote attacker to bypass content security policy via a crafted HTML page.. EPSS estimates a 15.73% chance of exploitation in the next 30 days.

Description

Insufficient policy enforcement in content security policy in Google Chrome prior to 91.0.4472.77 allowed a remote attacker to bypass content security policy via a crafted HTML page.

Metrics

CVSS 3.1

4.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

EPSS Probability

15.73%

96.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-863

Affected Software

Vendor	Product	Versions
Google	Chrome	< 91.0.4472.77
Fedoraproject	Fedora	33
Fedoraproject	Fedora	34

References

https://chromereleases.googleblog.com/2021/05/stable-channel-update-for-desktop_25.htmlRelease Notes, Vendor Advisory
https://crbug.com/1115045Exploit, Issue Tracking, Patch, Permissions Required, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ETMZL6IHCTCTREEL434BQ4THQ7EOHJ43/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PAT6EOXVQFE6JFMFQF4IKAOUQSHMHL54/
https://security.gentoo.org/glsa/202107-06Third Party Advisory
https://chromereleases.googleblog.com/2021/05/stable-channel-update-for-desktop_25.htmlRelease Notes, Vendor Advisory
https://crbug.com/1115045Exploit, Issue Tracking, Patch, Permissions Required, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ETMZL6IHCTCTREEL434BQ4THQ7EOHJ43/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PAT6EOXVQFE6JFMFQF4IKAOUQSHMHL54/
https://security.gentoo.org/glsa/202107-06Third Party Advisory

Timeline

Published: Jun 7, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-30538?

Insufficient policy enforcement in content security policy in Google Chrome prior to 91.0.4472.77 allowed a remote attacker to bypass content security policy via a crafted HTML page.

How severe is CVE-2021-30538?

CVE-2021-30538 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 15.73% probability of exploitation in the next 30 days.

How do I fix CVE-2021-30538?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-30538?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST