CVE-2020-6449Public exploitNetwork attack vector

Sandboxed code execution via dangling WebAudio handler

Published Mar 20, 2020 · Updated Aug 4, 2024

Use-after-free in Google Chrome before 80.0.3987.149 allows remote attackers to run code in the renderer via a crafted HTML page. DeferredTaskHandler::ClearHandlersToBeDeleted clears active_source_handlers_ without clearing finished_source_handlers_, leaving BreakConnections to dereference a freed AudioScheduleSourceHandler. A user must load the malicious page, and the resulting code execution remains confined to Chrome's renderer sandbox unless combined with a separate escape.

CVSS severity8.8
High
EPSS probability2.66%
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 before 80.0.3987.149 allows remote attackers to run code in the renderer via a crafted HTML page. DeferredTaskHandler::ClearHandlersToBeDeleted clears active_source_handlers_ without clearing finished_source_handlers_, leaving BreakConnections to dereference a freed AudioScheduleSourceHandler. A user must load the malicious page, and the resulting code execution remains confined to Chrome's renderer sandbox unless combined with a separate escape.

The record

CVE
CVE-2020-6449
Published
Mar 20, 2020
Updated
Aug 4, 2024
Vendor
Google Cloud
Product
Google Chrome
Classifications
CWE-416, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 20, 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 <80.0.3987.149

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Google Cloud · Google Chromeversion=unspecified <80.0.3987.149

Published CVSS scores

6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
8.8NIST NVDCVSS: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-416Use After Free
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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