CVE-2021-4322Network attack vector

Code execution via DevTools use after free

Published Jul 28, 2023 · Updated Feb 13, 2025

Use after free in DevTools in Google Chrome before 91.0.4472.77 allows attackers to execute arbitrary code through a crafted extension. Google identifies DevTools as the affected locus but has not published which object is freed or how the extension later causes that object to be reused. Exploitation requires a user to install the malicious extension, after which code executes with the browser process privileges.

CVSS severity8.8
High
EPSS probability0.54%
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 DevTools in Google Chrome before 91.0.4472.77 allows attackers to execute arbitrary code through a crafted extension. Google identifies DevTools as the affected locus but has not published which object is freed or how the extension later causes that object to be reused. Exploitation requires a user to install the malicious extension, after which code executes with the browser process privileges.

The record

CVE
CVE-2021-4322
Published
Jul 28, 2023
Updated
Feb 13, 2025
Vendor
Google Cloud
Product
Google Chrome
Classifications
CWE-416, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 28, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 2025Record 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 <91.0.4472.77
  2. Affected versionversion=91.0.4472.77 <91.0.4472.77

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Google Cloud · Google Chromeversion=0 <91.0.4472.77; version=91.0.4472.77 <91.0.4472.77

Published CVSS scores

8.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.8NIST NVDCVSS: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 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-416Use After Free
T1204.002User Execution: Malicious File

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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