CVE-2021-21148 Google Chromium V8 Heap Buffer Overflow

What is CVE-2021-21148?

CVE-2021-21148 is a high-severity memory corruption vulnerability in Debian Debian Linux, published on 9 Feb 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

Heap buffer overflow in V8 in Google Chrome prior to 88.0.4324.150 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

Weakness: CWE-787

Which versions are affected by CVE-2021-21148?

It affects 3 products.

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

How do I fix CVE-2021-21148?

Upgrade to a fixed version. US federal agencies must fix it by 17 Nov 2021.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2021-21148 being exploited?

Yes. Attackers have exploited CVE-2021-21148 in the wild since at least 3 Nov 2021.

Public exploit code: 1 proofs of concept on GitHub.

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 ALPINE-CVE-2021-21148, CLEANSTART-2026-NN99657, CLEANSTART-2026-RL59134, DEBIAN-CVE-2021-21148, GHSA-6675-f3rx-hqr9, UBUNTU-CVE-2021-21148 and 3 more.