CVE-2023-1220Public exploitNetwork attack vector

Heap corruption via unchecked UMA bucket index

Published Mar 7, 2023 · Updated Feb 13, 2025

Heap buffer overflow in Google Chrome before 111.0.5563.64 allows remote attackers to corrupt heap memory via a crafted HTML page. UMA's base::SampleVectorBase::MoveSingleSampleToCounts uses a stored sample bucket to index the counts array without a bounds check. Exploitation requires an already-compromised renderer, limiting the flaw to a subsequent memory-corruption stage.

CVSS severity8.8
High
EPSS probability1.03%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in Google Chrome before 111.0.5563.64 allows remote attackers to corrupt heap memory via a crafted HTML page. UMA's base::SampleVectorBase::MoveSingleSampleToCounts uses a stored sample bucket to index the counts array without a bounds check. Exploitation requires an already-compromised renderer, limiting the flaw to a subsequent memory-corruption stage.

The record

CVE
CVE-2023-1220
Published
Mar 7, 2023
Updated
Feb 13, 2025
Vendor
Google Cloud
Product
Google Chrome
Classifications
CWE-787, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 7, 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 <111.0.5563.64
  2. Affected versionversion=111.0.5563.64 <111.0.5563.64

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Google Cloud · Google Chromeversion=0 <111.0.5563.64; version=111.0.5563.64 <111.0.5563.64

Published CVSS scores

8.8NIST NVDCVSS: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.

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 exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1203Exploitation for Client Execution

Public exploit references

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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