CVE-2020-6493Network attack vector

Sandbox escape via WebAuthentication use-after-free

Published Jun 3, 2020 · Updated Aug 4, 2024

Use-after-free in WebAuthentication in Google Chrome before 83.0.4103.97 allows remote attackers to escape the sandbox via crafted HTML. Google identifies the WebAuthentication component but has not published the affected object, lifetime error, or operation that accesses the freed allocation. A user must load the crafted page after the renderer has already been compromised; success crosses the renderer sandbox boundary but does not establish a standalone initial compromise.

CVSS severity9.6
Critical
EPSS probability1.68%
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 WebAuthentication in Google Chrome before 83.0.4103.97 allows remote attackers to escape the sandbox via crafted HTML. Google identifies the WebAuthentication component but has not published the affected object, lifetime error, or operation that accesses the freed allocation. A user must load the crafted page after the renderer has already been compromised; success crosses the renderer sandbox boundary but does not establish a standalone initial compromise.

The record

CVE
CVE-2020-6493
Published
Jun 3, 2020
Updated
Aug 4, 2024
Vendor
Google Cloud
Product
Google Chrome
Classifications
CWE-416, T1068
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 3, 2020CVE 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 <83.0.4103.97

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Google Cloud · Google Chromeversion=unspecified <83.0.4103.97

Published CVSS scores

9.6Canonical Ubuntu SecurityCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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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