High‑Severity Use‑After‑Free in Google Chromium V8 (CVE‑2021‑4102) Risks Browser‑Based Execution
What It Is
CVE‑2021‑4102 is a use‑after‑free flaw in the V8 JavaScript engine that powers Google Chromium. A crafted HTML page can corrupt the heap, potentially leading to remote code execution on the victim’s machine.
Exploitability
The vulnerability has a publicly disclosed proof‑of‑concept and a CVSS v3.1 base score of 8.8 (High). No widespread active exploitation has been reported, but the existence of exploit code makes it a credible threat until patches are applied.
Affected Products
- Google Chromium V8 (core engine)
- All browsers built on Chromium, including Google Chrome, Microsoft Edge, Opera, and other Chromium‑based clients.
Why It Matters for Compliance & Audit Readiness
Control‑assurance programs require evidence that known high‑severity flaws are mitigated in a timely manner. Unpatched V8 exposes browsers to remote code execution, undermining access‑control and system‑integrity controls required by frameworks such as NIST CSF and ISO 27001. Demonstrating patch‑management diligence and maintaining an up‑to‑date inventory of browser versions strengthens the audit trail for vendor‑management and continuous monitoring controls.
Recommended Actions
- Verify that all Chromium‑based browsers are updated to the versions that include the CVE‑2021‑4102 fix (Chrome 96+, Edge 96+, Opera 82+).
- Use a software‑asset inventory tool to map browser versions to the affected control (e.g., “System Hardening – Patch Management”).
- Capture screenshot or automated report evidence of the patch status for audit purposes.
- If legacy applications require older browser versions, implement compensating controls such as network‑level URL filtering or sandboxing.
- Document the remediation steps in your vulnerability‑management workflow to maintain a defensible audit trail.
Source: https://nvd.nist.gov/vuln/detail/CVE-2021-4102