# firefox 84.0+build3-0ubuntu0.18.04.1: firefox 84.0+build3-0ubuntu0.18.04.1 for Ubuntu 18.04.6 LTS (bionic)

firefox 84.0+build3-0ubuntu0.18.04.1, released December 14, 2020, fixes 11 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-84.0-build3-0ubuntu0.18.04.1
- Platform: Linux
- Released: Dec 14, 2020
- Priority: High (Closes CVE-2020-26971, high severity)
- CVEs: 11, 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) | 84.0+build3-0ubuntu0.18.04.1 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2020-26971](https://patchblox.com/security/data/cve/CVE-2020-26971.md) | High | Firefox ESR and 2 others: Certain blit values provided by the user were not properly constrained leading to a heap buffer overflow… | 8.8 | 0.0190 |  |
| [CVE-2020-26973](https://patchblox.com/security/data/cve/CVE-2020-26973.md) | High | Firefox ESR and 2 others: Certain input to the CSS Sanitizer confused it, resulting in incorrect components being removed. | 8.8 | 0.0162 |  |
| [CVE-2020-35113](https://patchblox.com/security/data/cve/CVE-2020-35113.md) | High | Firefox ESR and 2 others: Mozilla developers reported memory safety bugs present in Firefox 83 and Firefox ESR 78.5. | 8.8 | 0.0157 |  |
| [CVE-2020-26974](https://patchblox.com/security/data/cve/CVE-2020-26974.md) | High | Firefox ESR and 2 others: When flex-basis was used on a table wrapper, a StyleGenericFlexBasis object could have been incorrectly… | 8.8 | 0.0153 |  |
| [CVE-2020-26972](https://patchblox.com/security/data/cve/CVE-2020-26972.md) | High | Firefox ESR and 1 other: The lifecycle of IPC Actors allows managed actors to outlive their manager actors; and the former must… | 9.8 | 0.0131 |  |
| [CVE-2020-35114](https://patchblox.com/security/data/cve/CVE-2020-35114.md) | High | Firefox ESR and 1 other: Mozilla developers reported memory safety bugs present in Firefox 83. | 8.8 | 0.0105 |  |
| [CVE-2020-26976](https://patchblox.com/security/data/cve/CVE-2020-26976.md) | Routine | Firefox ESR and 1 other: When a HTTPS pages was embedded in a HTTP page, and there was a service worker registered for the former,… | 6.5 | 0.0164 |  |
| [CVE-2020-35111](https://patchblox.com/security/data/cve/CVE-2020-35111.md) | Routine | Firefox ESR and 2 others: When an extension with the proxy permission registered to receive <all_urls>, the proxy.onRequest callback… | 4.3 | 0.0143 |  |
| [CVE-2020-26978](https://patchblox.com/security/data/cve/CVE-2020-26978.md) | Routine | Firefox ESR and 2 others: Using techniques that built on the slipstream research, a malicious webpage could have exposed both an… | 6.1 | 0.0133 |  |
| [CVE-2020-16042](https://patchblox.com/security/data/cve/CVE-2020-16042.md) | Routine | firefox: ELSA-2020-5562-1: firefox security update (IMPORTANT) | 6.5 | 0.0111 |  |
| [CVE-2020-26979](https://patchblox.com/security/data/cve/CVE-2020-26979.md) | Routine | Firefox ESR and 1 other: When a user typed a URL in the address bar or the search bar and quickly hit the enter key, a website… | 6.1 | 0.0073 |  |

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Data as of 2026-11-12T07:53:35Z 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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