CVE-2020-6556

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-09-21 · updated 2026-06-17
Weakness: CWE-787

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.

Affected products

Debian Linux: 10.0
Fedoraproject Fedora: 33
Google Chrome: before 84.0.4147.125 — fixed in 84.0.4147.125
openSUSE Leap: 15.1, 15.2

How to fix

Upgrade to a fixed version: Google Chrome 84.0.4147.125. Check the vendor advisory for mitigations.

References

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

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