CVE-2024-0808Network attack vector

Heap corruption via WebUI integer underflow

Published Jan 23, 2024 · Updated May 30, 2025

Integer underflow in WebUI in Google Chrome before 121.0.6167.85 allows remote attackers to corrupt heap memory via a malicious file. Google identifies the locus as WebUI, but the restricted issue record does not disclose which arithmetic operation underflows or how file data reaches it. A crafted file must reach the browser; public vendor material establishes heap corruption but does not establish code execution, a crash, or data access.

CVSS severity9.8
Critical
EPSS probability0.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer underflow in WebUI in Google Chrome before 121.0.6167.85 allows remote attackers to corrupt heap memory via a malicious file. Google identifies the locus as WebUI, but the restricted issue record does not disclose which arithmetic operation underflows or how file data reaches it. A crafted file must reach the browser; public vendor material establishes heap corruption but does not establish code execution, a crash, or data access.

The record

CVE
CVE-2024-0808
Published
Jan 23, 2024
Updated
May 30, 2025
Vendor
Google Cloud
Product
Google Chrome
Classifications
CWE-191
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 23, 2024CVE publishedPublication date reported by the CVE source.
  2. May 30, 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=121.0.6167.85 <121.0.6167.85

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Google Cloud · Google Chromeversion=121.0.6167.85 <121.0.6167.85

Published CVSS scores

9.8CISA ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/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-191Integer Underflow (Wrap or Wraparound)

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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