CVE-2023-6347Network attack vector

Remote heap corruption via Mojo use-after-free

Published Nov 29, 2023 · Updated Jun 5, 2025

Use-after-free in Mojo in Google Chrome before 119.0.6045.199 allows remote attackers to potentially corrupt heap via crafted HTML. The Mojo component uses freed memory when processing attacker-supplied page content, creating a heap-corruption condition. Exploitation requires a remote attacker to induce a Chrome user to load the crafted page; the published record establishes potential heap corruption but does not bound code-execution impact.

CVSS severity8.8
High
EPSS probability1.14%
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 Mojo in Google Chrome before 119.0.6045.199 allows remote attackers to potentially corrupt heap via crafted HTML. The Mojo component uses freed memory when processing attacker-supplied page content, creating a heap-corruption condition. Exploitation requires a remote attacker to induce a Chrome user to load the crafted page; the published record establishes potential heap corruption but does not bound code-execution impact.

The record

CVE
CVE-2023-6347
Published
Nov 29, 2023
Updated
Jun 5, 2025
Vendor
Google Cloud
Product
Google Chrome
Classifications
CWE-416, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 29, 2023CVE publishedPublication date reported by the CVE source.
  2. Jun 5, 2025Record 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=0 <=119.0.6045.199
  2. Affected versionversion=119.0.6045.199 <119.0.6045.199

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Google Cloud · Google Chromeversion=0 <=119.0.6045.199; version=119.0.6045.199 <119.0.6045.199

Published CVSS scores

8.8NVDCVSS: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

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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