CVE-2020-16025Public exploitNetwork attack vector

Sandbox escape via unchecked clipboard bitmap size

Published Jan 8, 2021 · Updated Aug 4, 2024

Heap buffer overflow in Google Chrome before 87.0.4280.66 allows remote attackers to escape the sandbox through a crafted HTML page. ClipboardWin::WriteBitmap trusts renderer-supplied bitmap dimensions when allocating a Windows DIB and copying pixel data, permitting a heap overwrite. Exploitation requires a previously compromised renderer and page interaction, and successful use crosses the browser sandbox boundary.

CVSS severity9.6
Critical
EPSS probability2.25%
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 87.0.4280.66 allows remote attackers to escape the sandbox through a crafted HTML page. ClipboardWin::WriteBitmap trusts renderer-supplied bitmap dimensions when allocating a Windows DIB and copying pixel data, permitting a heap overwrite. Exploitation requires a previously compromised renderer and page interaction, and successful use crosses the browser sandbox boundary.

The record

CVE
CVE-2020-16025
Published
Jan 8, 2021
Updated
Aug 4, 2024
Vendor
Google Cloud
Product
Google Chrome
Classifications
CWE-787, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 8, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record 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 <87.0.4280.66

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Google Cloud · Google Chromeversion=unspecified <87.0.4280.66

Published CVSS scores

6.8NIST National Vulnerability DatabaseAV:N/AC:M/Au:N/C:P/I:P/A:P
9.6NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/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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