CVE-2021-4102Known exploitationPublic exploitNetwork attack vector

Remote code execution via elided V8 write barrier

Published Feb 11, 2022 · Updated Oct 21, 2025

Use-after-free in V8 in Google Chrome before 96.0.4664.110 allows remote attackers to execute code via a crafted HTML page. Turbofan's SimplifiedOperatorReducer removes a tagged-number conversion after write-barrier selection, letting a young-generation HeapNumber enter an old-generation tagged-signed field without a barrier. A user must load attacker-controlled HTML; garbage collection can then free the referenced object and enable arbitrary memory access and code execution.

CVSS severity8.8
High
EPSS probability7.84%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in V8 in Google Chrome before 96.0.4664.110 allows remote attackers to execute code via a crafted HTML page. Turbofan's SimplifiedOperatorReducer removes a tagged-number conversion after write-barrier selection, letting a young-generation HeapNumber enter an old-generation tagged-signed field without a barrier. A user must load attacker-controlled HTML; garbage collection can then free the referenced object and enable arbitrary memory access and code execution.

The record

CVE
CVE-2021-4102
Published
Feb 11, 2022
Updated
Oct 21, 2025
Vendor
Google Cloud
Product
Google Chrome
Classifications
CWE-416, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 13, 2021Exploitation reportedGoogle reports exploitation in the wild
  2. Dec 15, 2021Exploitation reportedCISA Known Exploited Vulnerabilities entry
  3. Feb 11, 2022CVE publishedPublication date reported by the CVE source.
  4. Oct 21, 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=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

6.8NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
8.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.8CISA-ADPCVSS: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.

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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 exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
T1203Exploitation for Client Execution

Public exploit references

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

Reported exploitation

Technologies

Your stack

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Your stack

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