CVE-2020-6556

Name: CVE-2020-6556
Creator: NVD / NIST
Published: 2020-09-21T20:15:14.493+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 3.29%

Last modified Jun 17, 2026

CVE-2020-6556 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Heap buffer overflow in SwiftShader in Google Chrome prior to 84.0.4147.135 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.. EPSS estimates a 3.29% chance of exploitation in the next 30 days.

Description

Heap buffer overflow in SwiftShader in Google Chrome prior to 84.0.4147.135 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

3.29%

86.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Google	Chrome	< 84.0.4147.125
Debian	Debian Linux	10.0
Fedoraproject	Fedora	33
Opensuse	Leap	15.1
Opensuse	Leap	15.2

References

http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00049.htmlMailing List, Third Party Advisory
https://chromereleases.googleblog.com/2020/08/stable-channel-update-for-desktop_18.htmlVendor Advisory
https://crbug.com/1115345Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EE7XWIZBME7JAY7N6CGPET4CLNHHEIVT/
https://www.debian.org/security/2021/dsa-4824Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00049.htmlMailing List, Third Party Advisory
https://chromereleases.googleblog.com/2020/08/stable-channel-update-for-desktop_18.htmlVendor Advisory
https://crbug.com/1115345Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EE7XWIZBME7JAY7N6CGPET4CLNHHEIVT/
https://www.debian.org/security/2021/dsa-4824Third Party Advisory

Timeline

Published: Sep 21, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-6556?

Heap buffer overflow in SwiftShader in Google Chrome prior to 84.0.4147.135 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

How severe is CVE-2020-6556?

CVE-2020-6556 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 3.29% probability of exploitation in the next 30 days.

How do I fix CVE-2020-6556?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-6556?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST