CVE-2021-4098Network attack vector

Sandbox escape via insufficient Mojo data validation

Published Feb 11, 2022 · Updated Aug 3, 2024

Insufficient data validation in Google Chrome's Mojo component before 96.0.4664.110 allows remote attackers to escape its sandbox via crafted HTML. The Mojo IPC path accepts insufficiently validated data, but Google has not published the affected message, field, or validation error because the issue details remain access-restricted. Exploitation requires user interaction and an already compromised renderer process; the bounded result is an integrity-impacting escape from Chrome's sandbox.

CVSS severity7.4
High
EPSS probability0.65%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insufficient data validation in Google Chrome's Mojo component before 96.0.4664.110 allows remote attackers to escape its sandbox via crafted HTML. The Mojo IPC path accepts insufficiently validated data, but Google has not published the affected message, field, or validation error because the issue details remain access-restricted. Exploitation requires user interaction and an already compromised renderer process; the bounded result is an integrity-impacting escape from Chrome's sandbox.

The record

CVE
CVE-2021-4098
Published
Feb 11, 2022
Updated
Aug 3, 2024
Vendor
Google Cloud
Product
Google Chrome
Classifications
CWE-367, CWE-787, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 11, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=unspecified <96.0.4664.110

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Google Cloud · Google Chromeversion=unspecified <96.0.4664.110

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
7.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition
CWE-787Out-of-bounds Write
T1203Exploitation for Client Execution

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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