# firefox 86.0+build3-0ubuntu0.18.04.1: firefox 86.0+build3-0ubuntu0.18.04.1 for Ubuntu 18.04.6 LTS (bionic)

firefox 86.0+build3-0ubuntu0.18.04.1, released February 26, 2021, fixes 10 CVEs in firefox. None of them is reported as exploited. Patch Radar priority: Urgent. The product is no longer supported.

- Web page: https://patchblox.com/security/fix/linux/ubuntu-bionic-firefox-86.0-build3-0ubuntu0.18.04.1
- Platform: Linux
- Released: Feb 26, 2021
- Priority: Urgent (Closes CVE-2021-23978, rated Critical)
- CVEs: 10, 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) | 86.0+build3-0ubuntu0.18.04.1 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2021-23978](https://patchblox.com/security/data/cve/CVE-2021-23978.md) | Urgent | Firefox ESR and 2 others: Mozilla developers reported memory safety bugs present in Firefox 85 and Firefox ESR 78.7. | 8.8 | 0.0153 |  |
| [CVE-2021-23973](https://patchblox.com/security/data/cve/CVE-2021-23973.md) | Urgent | Firefox ESR and 2 others: When trying to load a cross-origin resource in an audio/video context a decoding error may have resulted,… | 6.5 | 0.0137 |  |
| [CVE-2021-23968](https://patchblox.com/security/data/cve/CVE-2021-23968.md) | Urgent | Firefox ESR and 2 others: If Content Security Policy blocked frame navigation, the full destination of a redirect served in the… | 4.3 | 0.0131 |  |
| [CVE-2021-23969](https://patchblox.com/security/data/cve/CVE-2021-23969.md) | Urgent | Firefox ESR and 2 others: As specified in the W3C Content Security Policy draft, when creating a violation report, "User agents… | 4.3 | 0.0121 |  |
| [CVE-2021-23972](https://patchblox.com/security/data/cve/CVE-2021-23972.md) | High | Firefox ESR and 1 other: One phishing tactic on the web is to provide a link with HTTP Auth. | 8.8 | 0.0101 |  |
| [CVE-2021-23979](https://patchblox.com/security/data/cve/CVE-2021-23979.md) | High | Firefox ESR and 1 other: Mozilla developers reported memory safety bugs present in Firefox 85. | 8.8 | 0.0093 |  |
| [CVE-2021-23975](https://patchblox.com/security/data/cve/CVE-2021-23975.md) | Routine | Firefox ESR and 1 other: The developer page about:memory has a Measure function for exploring what object types the browser has… | 6.5 | 0.0101 |  |
| [CVE-2021-23970](https://patchblox.com/security/data/cve/CVE-2021-23970.md) | Routine | Firefox ESR and 1 other: Context-specific code was included in a shared jump table; resulting in assertions being triggered in… | 6.5 | 0.0101 |  |
| [CVE-2021-23971](https://patchblox.com/security/data/cve/CVE-2021-23971.md) | Routine | Firefox ESR and 1 other: When processing a redirect with a conflicting Referrer-Policy, Firefox would have adopted the redirect's… | 6.5 | 0.0101 |  |
| [CVE-2021-23974](https://patchblox.com/security/data/cve/CVE-2021-23974.md) | Routine | Firefox ESR and 1 other: The DOMParser API did not properly process '<noscript>' elements for escaping. | 6.1 | 0.0075 |  |

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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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