# firefox 85.0+build1-0ubuntu0.18.04.1: firefox 85.0+build1-0ubuntu0.18.04.1 for Ubuntu 18.04.6 LTS (bionic)

firefox 85.0+build1-0ubuntu0.18.04.1, released January 25, 2021, 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-85.0-build1-0ubuntu0.18.04.1
- Platform: Linux
- Released: Jan 25, 2021
- Priority: High (Closes CVE-2021-23961, 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) | 85.0+build1-0ubuntu0.18.04.1 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2021-23961](https://patchblox.com/security/data/cve/CVE-2021-23961.md) | High | Firefox ESR and 1 other: Further techniques that built on the slipstream research combined with a malicious webpage could have… | 7.4 | 0.0148 |  |
| [CVE-2021-23964](https://patchblox.com/security/data/cve/CVE-2021-23964.md) | High | Firefox ESR and 2 others: Mozilla developers reported memory safety bugs present in Firefox 84 and Firefox ESR 78.6. | 8.8 | 0.0136 |  |
| [CVE-2021-23960](https://patchblox.com/security/data/cve/CVE-2021-23960.md) | High | Firefox ESR and 2 others: Performing garbage collection on re-declared JavaScript variables resulted in a user-after-poison, and… | 8.8 | 0.0129 |  |
| [CVE-2021-23954](https://patchblox.com/security/data/cve/CVE-2021-23954.md) | High | Firefox ESR and 2 others: Using the new logical assignment operators in a JavaScript switch statement could have caused a type… | 8.8 | 0.0119 |  |
| [CVE-2021-23965](https://patchblox.com/security/data/cve/CVE-2021-23965.md) | High | Firefox ESR and 1 other: Mozilla developers reported memory safety bugs present in Firefox 84. | 8.8 | 0.0097 |  |
| [CVE-2021-23962](https://patchblox.com/security/data/cve/CVE-2021-23962.md) | High | Firefox ESR and 1 other: Incorrect use of the '<RowCountChanged>' method could have led to a user-after-poison and a potentially… | 8.8 | 0.0089 |  |
| [CVE-2021-23953](https://patchblox.com/security/data/cve/CVE-2021-23953.md) | Routine | Firefox ESR and 2 others: If a user clicked into a specifically crafted PDF, the PDF reader could be confused into leaking cross-origin… | 4.3 | 0.0106 |  |
| [CVE-2021-23956](https://patchblox.com/security/data/cve/CVE-2021-23956.md) | Routine | Firefox ESR and 1 other: An ambiguous file picker design could have confused users who intended to select and upload a single… | 6.5 | 0.0099 |  |
| [CVE-2021-23958](https://patchblox.com/security/data/cve/CVE-2021-23958.md) | Routine | Firefox ESR and 1 other: The browser could have been confused into transferring a screen sharing state into another tab, which… | 6.5 | 0.0088 |  |
| [CVE-2021-23955](https://patchblox.com/security/data/cve/CVE-2021-23955.md) | Routine | Firefox ESR and 1 other: The browser could have been confused into transferring a pointer lock state into another tab, which could… | 6.1 | 0.0066 |  |
| [CVE-2021-23963](https://patchblox.com/security/data/cve/CVE-2021-23963.md) | Routine | Firefox ESR and 1 other: When sharing geolocation during an active WebRTC share, Firefox could have reset the webRTC sharing state… | 4.3 | 0.0066 |  |

---

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

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.