CVE-2020-6559 Use after free in Chrome

What is CVE-2020-6559?

CVE-2020-6559 is a high-severity use after free vulnerability in Debian Debian Linux, published on 21 Sep 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

Use after free in presentation API in Google Chrome prior to 85.0.4183.83 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

Weakness: CWE-787, CWE-416

Which versions are affected by CVE-2020-6559?

It affects 5 products.

Products include Debian Debian Linux, Fedoraproject Fedora, Google Chrome, Opensuse Backports Sle, Opensuse Leap.

How do I fix CVE-2020-6559?

Upgrade to a fixed version.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2020-6559 being exploited?

There is no known exploitation of CVE-2020-6559 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2020-6559, GHSA-x6cp-vv2p-mcvh, UBUNTU-CVE-2020-6559.