CVE-2021-21173 Information disclosure in Chrome

What is CVE-2021-21173?

CVE-2021-21173 is a medium-severity vulnerability in Debian Debian Linux, published on 9 Mar 2021. 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

Side-channel information leakage in Network Internals in Google Chrome prior to 89.0.4389.72 allowed a remote attacker to leak cross-origin data via a crafted HTML page.

Weakness: CWE-203

Which versions are affected by CVE-2021-21173?

It affects 3 products.

Products include Debian Debian Linux, Fedoraproject Fedora, Google Chrome.

How do I fix CVE-2021-21173?

Upgrade to a fixed version.

Is CVE-2021-21173 being exploited?

There is no known exploitation of CVE-2021-21173 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 CLEANSTART-2024-FI56584, DEBIAN-CVE-2021-21173, GHSA-879h-24p2-cvv7, UBUNTU-CVE-2021-21173.