CVE-2021-30632

What the flaw is

Google Chromium V8 Engine contains an out-of-bounds write vulnerability that allows a remote attacker to potentially exploit heap corruption via a crafted HTML page. This vulnerability could affect multiple web browsers that utilize Chromium, including, but not limited to, Google Chrome, Microsoft Edge, and Opera.

Description as published by CISA. We have not independently reproduced it.

What CISA requires

Apply updates per vendor instructions.

This deadline is binding on US federal civilian agencies under BOD 22-01. It is not a legal deadline for anyone else, but it is a useful urgency signal — CISA sets it by how actively the flaw is being used, not by CVSS.

Public exploit code

25 public repositories referencing this CVE have been catalogued on GitHub. Treat this as a strong signal to prioritise patching, not as a verified working exploit — many such repositories are scanners, write-ups or forks rather than functional code.

• ARPSyndicate/cve-scores
• ARPSyndicate/cvemon
• CrackerCat/CVE-2021-30632
• CrackerCat/cve-win
• Mr-xn/Penetration_Testing_POC
• Ostorlab/KEV
• Ostorlab/known_exploited_vulnerbilities_detectors
• Phuong39/PoC-CVE-2021-30632

Showing 8 of 25. Full list in the trickest/cve dataset.

Vendor advisories

• nvd.nist.gov/vuln/detail/CVE-2021-30632

Primary sources

• NVD entry — CVSS score, CPE list and references
• CISA KEV catalog — the source for this page
• CVE Record at cve.org