CVE-2020-6429Network attack vector

Renderer heap corruption via stale WebAudio context

Published Mar 20, 2020 · Updated Aug 4, 2024

Use-after-free in Google Chrome before 80.0.3987.149 allows remote attackers to corrupt renderer heap memory through a crafted HTML page. The WebAudio AudioScheduledSourceHandler::Finish method queues NotifyEnded while retaining the handler but not its context, so NotifyEnded calls GetExecutionContext after context_ is destroyed. Opening attacker-controlled content is required, and successful heap corruption occurs inside the renderer sandbox with confidentiality, integrity, and availability impact.

CVSS severity8.8
High
EPSS probability2.31%
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 corrupt renderer heap memory through a crafted HTML page. The WebAudio AudioScheduledSourceHandler::Finish method queues NotifyEnded while retaining the handler but not its context, so NotifyEnded calls GetExecutionContext after context_ is destroyed. Opening attacker-controlled content is required, and successful heap corruption occurs inside the renderer sandbox with confidentiality, integrity, and availability impact.

The record

CVE
CVE-2020-6429
Published
Mar 20, 2020
Updated
Aug 4, 2024
Vendor
Google Cloud
Product
Google Chrome
Classifications
CWE-787, 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 exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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