# firefox 87.0+build3-0ubuntu0.18.04.2: firefox 87.0+build3-0ubuntu0.18.04.2 for Ubuntu 18.04.6 LTS (bionic)

firefox 87.0+build3-0ubuntu0.18.04.2, released June 24, 2021, fixes 9 CVEs in firefox. None of them is reported as exploited. Patch Radar priority: High. The product is no longer supported.

- Web page: https://patchblox.com/security/fix/linux/ubuntu-bionic-firefox-87.0-build3-0ubuntu0.18.04.2
- Platform: Linux
- Released: Jun 24, 2021
- Priority: High (Closes CVE-2021-23987, high severity)
- CVEs: 9, exploited: 0, on CISA KEV: 0

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [firefox](https://patchblox.com/security/data/product/linux/firefox.md) | Ubuntu 18.04.6 LTS (bionic) | 87.0+build3-0ubuntu0.18.04.2 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2021-23987](https://patchblox.com/security/data/cve/CVE-2021-23987.md) | High | Firefox ESR and 2 others: Mozilla developers and community members reported memory safety bugs present in Firefox 86 and Firefox… | 8.8 | 0.0142 |  |
| [CVE-2021-23981](https://patchblox.com/security/data/cve/CVE-2021-23981.md) | High | Firefox ESR and 2 others: A texture upload of a Pixel Buffer Object could have confused the WebGL code to skip binding the buffer… | 8.1 | 0.0115 |  |
| [CVE-2021-23988](https://patchblox.com/security/data/cve/CVE-2021-23988.md) | High | Firefox ESR and 1 other: Mozilla developers reported memory safety bugs present in Firefox 86. | 8.8 | 0.0108 |  |
| [CVE-2021-23985](https://patchblox.com/security/data/cve/CVE-2021-23985.md) | Routine | Firefox ESR and 1 other: If an attacker is able to alter specific about:config values (for example malware running on the user's… | 6.5 | 0.0151 |  |
| [CVE-2021-29955](https://patchblox.com/security/data/cve/CVE-2021-29955.md) | Routine | Firefox ESR and 1 other: A transient execution vulnerability, named Floating Point Value Injection (FPVI) allowed an attacker… | 5.3 | 0.0148 |  |
| [CVE-2021-23984](https://patchblox.com/security/data/cve/CVE-2021-23984.md) | Routine | Firefox ESR and 2 others: A malicious extension could have opened a popup window lacking an address bar. | 6.5 | 0.0111 |  |
| [CVE-2021-23982](https://patchblox.com/security/data/cve/CVE-2021-23982.md) | Routine | Firefox ESR and 2 others: Using techniques that built on the slipstream research, a malicious webpage could have scanned both an… | 6.5 | 0.0074 |  |
| [CVE-2021-23983](https://patchblox.com/security/data/cve/CVE-2021-23983.md) | Routine | Firefox ESR and 1 other: By causing a transition on a parent node by removing a CSS rule, an invalid property for a marker could… | 6.5 | 0.0074 |  |
| [CVE-2021-23986](https://patchblox.com/security/data/cve/CVE-2021-23986.md) | Routine | Firefox ESR and 1 other: A malicious extension with the 'search' permission could have installed a new search engine whose favicon… | 6.5 | 0.0043 |  |

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Data as of 2026-11-12T19:57:06Z 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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