# CVE-2021-21148: Google Chromium V8 Heap Buffer Overflow Vulnerability

Source: https://junglewise.ai/threats/cve-2021-21148-google-chromium-v8-heap-buffer-overflow-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2021-11-03. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2021-21148 · Severity: critical · CVSS 8.8 · Exploited in the wild · Published 2021-11-03

A heap buffer overflow vulnerability exists in the Google Chromium V8 engine. A remote attacker can exploit this via a specially crafted HTML page to cause heap corruption, potentially leading to arbitrary code execution.

Technologies: [Google Chromium V8](https://junglewise.ai/threats/technologies/chromium-v8). Vendors: [Google](https://junglewise.ai/threats/vendors/google).

## Quick answers

**Is CVE-2021-21148 exploited in the wild?** Yes. CVE-2021-21148 is known to be exploited in the wild, first recorded on 3 November 2021. Treat it as urgent.

**How severe is CVE-2021-21148?** Critical severity, with a CVSS score of 8.8, published 3 November 2021.

**Which products and versions are affected?** Google Chrome prior to 88.0.4324.150; Google V8 Engine prior to 88.0.4324.150; Microsoft Edge; Opera Opera.

**Is there a fix for CVE-2021-21148?** A patch was published on 2021-02-04: Stable channel update for desktop 88.0.4324.150 released. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2021-21148 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2021-21148?** Check whether you run Google Chromium V8. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Google Chrome prior to 88.0.4324.150
- Google V8 Engine prior to 88.0.4324.150
- Microsoft Edge
- Opera Opera

## Timeline

- 2021-02-04: patched: Stable channel update for desktop 88.0.4324.150 released.
- 2021-11-03: kev added: Added to CISA Known Exploited Vulnerabilities Catalog.
- 2021-11-03: disclosed: Publicly published.

## Related threats

- [Google Chromium V8 out-of-bounds write in JavaScript engine](https://junglewise.ai/threats/cve-2026-87491-google-chromium-v8-out-of-bounds-write-in-javascript-engine)
- [Google Chromium V8 type confusion vulnerability](https://junglewise.ai/threats/cve-2026-85046-google-chromium-v8-type-confusion-vulnerability)
- [Google Chrome V8 out of bounds read and write](https://junglewise.ai/threats/cve-2026-11645-google-chrome-v8-out-of-bounds-read-and-write)
- [Google Chromium V8 memory corruption in JavaScript engine](https://junglewise.ai/threats/cve-2026-3910-google-chromium-v8-memory-corruption-in-javascript-engine)
- [Google Chrome type confusion in V8 engine](https://junglewise.ai/threats/cve-2025-13223-google-chrome-type-confusion-in-v8-engine)