CVE-2020-16018Network attack vector

Sandbox escape via stale PaymentCredential callback

Published Jan 8, 2021 · Updated Aug 4, 2024

Use-after-free in Google Chrome payments before 87.0.4280.66 allows remote attackers with a compromised renderer to escape the sandbox. The PaymentCredential::DidDownloadFavicon path passes its object as a raw callback pointer, while creation of another binding can destroy that object before the callback runs. A crafted HTML page must first compromise the renderer; successful reuse of the freed browser-side object crosses the renderer sandbox boundary.

CVSS severity9.6
Critical
EPSS probability0.99%
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 Google Chrome payments before 87.0.4280.66 allows remote attackers with a compromised renderer to escape the sandbox. The PaymentCredential::DidDownloadFavicon path passes its object as a raw callback pointer, while creation of another binding can destroy that object before the callback runs. A crafted HTML page must first compromise the renderer; successful reuse of the freed browser-side object crosses the renderer sandbox boundary.

The record

CVE
CVE-2020-16018
Published
Jan 8, 2021
Updated
Aug 4, 2024
Vendor
Google Cloud
Product
Google Chrome
Classifications
CWE-416, T1068
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

7.0NIST 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 exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1068Exploitation for Privilege Escalation

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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