What is CVE-2021-21200?

CVE-2021-21200 is a medium-severity vulnerability in Google Chrome, classified under Out-of-bounds Read. CVSS score: 5.4/10. Published 2023-01-02.

How severe is CVE-2021-21200?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Out-of-bounds Read in Google Chrome

CVE-2021-21200

Out of bounds read in WebUI Settings in Google Chrome prior to 89.0.4389.72 allowed a remote attacker to perform an out of bounds memory read via a crafted HTML page. (Chrome security severity: Low)

Vulnerability class: Buffer Overflow

Published 2023-01-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L.

EPSS exploit prediction

EPSS: 0.004 (36.4th percentile), scored 2026-10-07.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 36.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Google Chrome — versions unspecified

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

chromereleases.googleblog.com/2021/03/stable-channel-update-for-desktop.html (Release Notes, Vendor Advisory)
crbug.com/1164816 (Exploit, Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2021-21200?: CVE-2021-21200 is a medium-severity vulnerability in Google Chrome, classified under Out-of-bounds Read. CVSS score: 5.4/10. Published 2023-01-02.
How severe is CVE-2021-21200?: Medium severity. CVSS v3 base score is 5.4 out of 10.