CVE-2021-38023Network attack vector

Heap corruption via synchronous debug-port callback

Published Sep 23, 2024 · Updated Sep 24, 2024

Use-after-free in Extensions in Google Chrome before 92.0.4515.107 allows remote attackers to corrupt heap memory via a crafted HTML page. TaskGroup::RefreshNaClDebugStubPort reports synchronously with ProcessHostOnUI enabled, allowing TaskGroup deletion during Refresh and reuse afterward. A user must open the crafted page; successful exploitation corrupts browser-process heap memory, causing a crash or code execution within the browser process.

CVSS severity8.8
High
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Extensions in Google Chrome before 92.0.4515.107 allows remote attackers to corrupt heap memory via a crafted HTML page. TaskGroup::RefreshNaClDebugStubPort reports synchronously with ProcessHostOnUI enabled, allowing TaskGroup deletion during Refresh and reuse afterward. A user must open the crafted page; successful exploitation corrupts browser-process heap memory, causing a crash or code execution within the browser process.

The record

CVE
CVE-2021-38023
Published
Sep 23, 2024
Updated
Sep 24, 2024
Vendor
Google Cloud
Product
Google Chrome
Classifications
CWE-416, T1203, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 23, 2024CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 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=0 <92.0.4515.107
  2. Affected versionversion=92.0.4515.107 <92.0.4515.107

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Google Cloud · Google Chromeversion=0 <92.0.4515.107; version=92.0.4515.107 <92.0.4515.107

Published CVSS scores

8.8UbuntuCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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-416Use After Free
T1203Exploitation for Client Execution
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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