What is CVE-2021-38004?

CVE-2021-38004 is a medium-severity vulnerability in Google Chrome, classified under Exposure of Resource to Wrong Sphere. CVSS score: 4.3/10. Published 2021-11-23.

How severe is CVE-2021-38004?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Google Chrome

CVE-2021-38004

Insufficient policy enforcement in Autofill in Google Chrome prior to 95.0.4638.69 allowed a remote attacker to leak cross-origin data via a crafted HTML page.

Published 2021-11-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.009 (57.2th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.009 · change: +0.000

Affected products

Google Chrome — versions unspecified
Debian Linux — versions 10.0, 11.0

Weakness classification (CWE)

CWE-668 — Exposure of Resource to Wrong Sphere

References

chromereleases.googleblog.com/2021/10/stable-channel-update-for-desktop_28.html (Release Notes, Vendor Advisory)
crbug.com/1227170 (Permissions Required, Vendor Advisory)
www.debian.org/security/2022/dsa-5046 (vendor-advisory, Third Party Advisory)

Frequently asked questions

What is CVE-2021-38004?: CVE-2021-38004 is a medium-severity vulnerability in Google Chrome, classified under Exposure of Resource to Wrong Sphere. CVSS score: 4.3/10. Published 2021-11-23.
How severe is CVE-2021-38004?: Medium severity. CVSS v3 base score is 4.3 out of 10.