# CVE-2021-21148: Chromium CVE-2021-21148: Heap buffer overflow in V8

CVE-2021-21148 is fixed in 5 products on 1 platform, first by chromium-browser 89.0.4389.82-0ubuntu0.18.04.1, released January 2, 2023. It is being exploited: CISA added it to the Known Exploited Vulnerabilities catalog on November 3, 2021. Patch Radar priority: Patch now.

- Web page: https://patchblox.com/security/cve/CVE-2021-21148
- Priority: Patch now
- CVSS: n/a (Medium)
- EPSS: 0.1997
- CISA KEV: listed Nov 3, 2021, federal due date Nov 17, 2021
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 5, 2021
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-21148

## Description

<p>This CVE was assigned by Chrome.  Microsoft Edge (Chromium-based) ingests Chromium, which addresses this vulnerability. Please see <a href="https://chromereleases.googleblog.com/2021">Google Chrome Releases</a> for more information.</p> <p><strong>This CVE has been reported to be exploited in the wild.</strong></p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | chromium-browser Ubuntu 18.04.6 LTS (bionic) | 89.0.4389.82-0ubuntu0.18.04.1 | [chromium-browser 89.0.4389.82-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-chromium-browser-89.0.4389.82-0ubuntu0.18.04.1.md) | Jan 2, 2023 |
| Linux | chromium-browser-l10n Ubuntu 18.04.6 LTS (bionic) | 89.0.4389.82-0ubuntu0.18.04.1 | [chromium-browser-l10n 89.0.4389.82-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-chromium-browser-l10n-89.0.4389.82-0ubuntu0.18.04.1.md) | Jan 2, 2023 |
| Linux | chromium-chromedriver Ubuntu 18.04.6 LTS (bionic) | 89.0.4389.82-0ubuntu0.18.04.1 | [chromium-chromedriver 89.0.4389.82-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-chromium-chromedriver-89.0.4389.82-0ubuntu0.18.04.1.md) | Jan 2, 2023 |
| Linux | chromium-codecs-ffmpeg Ubuntu 18.04.6 LTS (bionic) | 89.0.4389.82-0ubuntu0.18.04.1 | [chromium-codecs-ffmpeg 89.0.4389.82-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-chromium-codecs-ffmpeg-89.0.4389.82-0ubuntu0.18.04.1.md) | Jan 2, 2023 |
| Linux | chromium-codecs-ffmpeg-extra Ubuntu 18.04.6 LTS (bionic) | 89.0.4389.82-0ubuntu0.18.04.1 | [chromium-codecs-ffmpeg-extra 89.0.4389.82-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-chromium-codecs-ffmpeg-extra-89.0.4389.82-0ubuntu0.18.04.1.md) | Jan 2, 2023 |

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Data as of 2026-11-08T19:12:23Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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