CVE-2021-38004Network attack vector

Cross-origin data disclosure via Autofill policy failure

Published Nov 23, 2021 · Updated Aug 4, 2024

Insufficient policy enforcement in Google Chrome Autofill before 95.0.4638.69 allows remote attackers to leak cross-origin data. Google identifies Autofill as the affected component but has not published the exact policy check or operation that exposes data across origins. Exploitation requires a user to open a crafted HTML page, and the reported consequence is limited to unauthorized reading of cross-origin data.

CVSS severity4.3
Medium
EPSS probability0.87%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insufficient policy enforcement in Google Chrome Autofill before 95.0.4638.69 allows remote attackers to leak cross-origin data. Google identifies Autofill as the affected component but has not published the exact policy check or operation that exposes data across origins. Exploitation requires a user to open a crafted HTML page, and the reported consequence is limited to unauthorized reading of cross-origin data.

The record

CVE
CVE-2021-38004
Published
Nov 23, 2021
Updated
Aug 4, 2024
Vendor
Google Cloud
Product
Google Chrome
Classifications
CWE-668, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 23, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <95.0.4638.69

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Google Cloud · Google Chromeversion=unspecified <95.0.4638.69

Published CVSS scores

4.3UbuntuCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-668Exposure of Resource to Wrong Sphere
T1189Drive-by Compromise

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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