CVE-2021-30561

Name: CVE-2021-30561
Creator: NVD / NIST
Published: 2021-08-03T19:15:08.16+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 4.74%

Last modified Jun 17, 2026

CVE-2021-30561 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Type Confusion in V8 in Google Chrome prior to 91.0.4472.164 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.. EPSS estimates a 4.74% chance of exploitation in the next 30 days.

Description

Type Confusion in V8 in Google Chrome prior to 91.0.4472.164 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

4.74%

90.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-843

Affected Software

Vendor	Product	Versions
Google	Chrome	< 91.0.4472.164

References

http://packetstormsecurity.com/files/163835/Chrome-JS-WasmJs-InstallConditionalFeatures-Object-Corruption.htmlExploit, Third Party Advisory, VDB Entry
https://chromereleases.googleblog.com/2021/07/stable-channel-update-for-desktop.htmlRelease Notes, Vendor Advisory
https://crbug.com/1219630Permissions Required, Vendor Advisory
http://packetstormsecurity.com/files/163835/Chrome-JS-WasmJs-InstallConditionalFeatures-Object-Corruption.htmlExploit, Third Party Advisory, VDB Entry
https://chromereleases.googleblog.com/2021/07/stable-channel-update-for-desktop.htmlRelease Notes, Vendor Advisory
https://crbug.com/1219630Permissions Required, Vendor Advisory

Timeline

Published: Aug 3, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-30561?

Type Confusion in V8 in Google Chrome prior to 91.0.4472.164 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

How severe is CVE-2021-30561?

CVE-2021-30561 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 4.74% probability of exploitation in the next 30 days.

How do I fix CVE-2021-30561?

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-2021-30561?

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

Scan your code now

Source: NVD / NIST