CVE-2023-1533Network attack vector

Heap corruption via WebProtect use after free

Published Mar 21, 2023 · Updated Feb 13, 2025

Use after free in WebProtect in Google Chrome before 111.0.5563.110 allows remote attackers to corrupt heap memory through crafted HTML. Public records identify WebProtect as the locus but do not disclose which object is freed or the later operation that dereferences it. A user must load the attacker-controlled page; exploitation corrupts the browser heap, while the public record does not establish a sandbox escape.

CVSS severity8.8
High
EPSS probability0.85%
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 WebProtect in Google Chrome before 111.0.5563.110 allows remote attackers to corrupt heap memory through crafted HTML. Public records identify WebProtect as the locus but do not disclose which object is freed or the later operation that dereferences it. A user must load the attacker-controlled page; exploitation corrupts the browser heap, while the public record does not establish a sandbox escape.

The record

CVE
CVE-2023-1533
Published
Mar 21, 2023
Updated
Feb 13, 2025
Vendor
Google Cloud
Product
Google Chrome
Classifications
CWE-416, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 21, 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 <111.0.5563.110
  2. Affected versionversion=111.0.5563.110 <111.0.5563.110

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Google Cloud · Google Chromeversion=0 <111.0.5563.110; version=111.0.5563.110 <111.0.5563.110

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 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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