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Vulnerability record · CVE-2020-6418 · published 27 February 2020

CVE-2020-6418: Google Chrome V8 type confusion enables heap corruption

Google · Chrome

Google Chrome before 80.0.3987.122 contains a type confusion flaw in the V8 JavaScript engine. A crafted HTML page can trigger the confusion and corrupt the heap, which makes the bug a serious browser-side memory corruption issue.

8.8 CVSS 3.1 High CISA KEV since 3 Nov 2021 EPSS 79% · top 0.4% CWE-843 · Type confusion
8.8CVSS 3.1 base score, v2 6.8
79%EPSS exploitation probability, 30 days
YesIn CISA KEV, fix deadline passed
6Affected product versions listed by NVD
17References, 4 tagged exploit
17 Jun 2026Last modified by NVD

Description

Type confusion in V8 in Google Chrome prior to 80.0.3987.122 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Automated analysis

Generated by VULONE's analysis model from the NVD record, CISA KEV and EPSS data on 17 September 2026. Confidence: high.

high priorityThe flaw is remotely reachable, has public exploit references and is in CISA KEV with very high EPSS, though it requires user interaction and a patched version has long been available.

What it is

Google Chrome before 80.0.3987.122 contains a type confusion flaw in the V8 JavaScript engine. A crafted HTML page can trigger the confusion and corrupt the heap, which makes the bug a serious browser-side memory corruption issue.

Impact

An attacker who gets the page rendered in a vulnerable browser can potentially corrupt heap memory and execute code in the browser process context. The CVSS vector rates confidentiality, integrity and availability impact as high.

Attack surface

Reached over the network by loading a crafted HTML page; no privileges are required but the victim must interact by visiting or opening the page (UI:R). No authentication is needed.

Exploitation

CVE-2020-6418 is listed in CISA KEV (added 2021-11-03) and has an EPSS 30-day probability of 0.788 (99.57th percentile). Multiple references are tagged Exploit, indicating public exploit material exists.

What to do

  • Upgrade Chrome to 80.0.3987.122 or later, and apply the corresponding vendor updates for Fedora, Red Hat Enterprise Linux and Debian packages.
  • Enforce automatic browser updates and verify installed versions across managed endpoints.
  • Restrict or isolate browsing of untrusted web content, and block known malicious sites at the network layer.
  • Keep Chromium-based browsers and embedded browser components on supported, patched versions.
  • Monitor vendor advisories for follow-up fixes to the same V8 component.

Detection

  • Alert on Chrome or Chromium versions below 80.0.3987.122 in endpoint inventory.
  • Hunt for browser processes spawning unexpected child processes or making anomalous outbound connections after page loads.
  • Review proxy and DNS logs for access to known exploit-hosting or malvertising domains.
  • Correlate endpoint crash reports from chrome.exe or the renderer with suspicious page visits.

This assessment is produced automatically and is not human-reviewed. Verify against the vendor advisory before acting on it.

Exploitation in the wild

CISA added CVE-2020-6418 to the Known Exploited Vulnerabilities catalog on 3 November 2021 as "Google Chromium V8 Type Confusion Vulnerability". Required action: Apply updates per vendor instructions. Federal deadline 3 May 2022.

Affected products

6 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://packetstormsecurity.com/files/156632/Google-Chrome-80-JSCreate-Side-Effect-Type-Confusion.html ExploitThird Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2020:0738 Third Party Advisory
https://chromereleases.googleblog.com/2020/02/stable-channel-update-for-desktop_24.html Release NotesVendor Advisory
https://crbug.com/1053604 ExploitIssue TrackingPatchVendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6IOHSO6BUKC6I66J5PZOMAG Release Notes
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X3B5RWJQD5LA45MYLLR55KZ Release Notes
https://security.gentoo.org/glsa/202003-08 Third Party Advisory
https://www.debian.org/security/2020/dsa-4638 Mailing ListThird Party Advisory
http://packetstormsecurity.com/files/156632/Google-Chrome-80-JSCreate-Side-Effect-Type-Confusion.html ExploitThird Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2020:0738 Third Party Advisory
https://chromereleases.googleblog.com/2020/02/stable-channel-update-for-desktop_24.html Release NotesVendor Advisory
https://crbug.com/1053604 ExploitIssue TrackingPatchVendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6IOHSO6BUKC6I66J5PZOMAG Release Notes
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X3B5RWJQD5LA45MYLLR55KZ Release Notes
https://security.gentoo.org/glsa/202003-08 Third Party Advisory
https://www.debian.org/security/2020/dsa-4638 Mailing ListThird Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-6418 US Government Resource

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Source: NIST National Vulnerability Database (record CVE-2020-6418), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.