CVE-2020-16040Public exploitNetwork attack vector

Heap corruption via TurboFan integer overflow

Published Jan 8, 2021 · Updated Aug 4, 2024

Insufficient input validation in Google Chrome before 87.0.4280.88 allows remote attackers to corrupt V8 heap memory via crafted HTML. TurboFan SimplifiedLowering assigns a signed-addition result an incorrect range, then lowers it without the overflow check required for the wrapped value. A user must load attacker-controlled content; published exploitation reaches renderer code execution, while host execution requires a disabled sandbox or a separate escape.

CVSS severity6.5
Medium
EPSS probability99.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insufficient input validation in Google Chrome before 87.0.4280.88 allows remote attackers to corrupt V8 heap memory via crafted HTML. TurboFan SimplifiedLowering assigns a signed-addition result an incorrect range, then lowers it without the overflow check required for the wrapped value. A user must load attacker-controlled content; published exploitation reaches renderer code execution, while host execution requires a disabled sandbox or a separate escape.

The record

CVE
CVE-2020-16040
Published
Jan 8, 2021
Updated
Aug 4, 2024
Vendor
Google Cloud
Product
Google Chrome
Classifications
CWE-787, CWE-20, CWE-190, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <87.0.4280.88

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Google Cloud · Google Chromeversion=unspecified <87.0.4280.88

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:N/A:P
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/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
CWE-20Improper Input Validation
CWE-190Integer Overflow or Wraparound
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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