# firefox 88.0+build2-0ubuntu0.18.04.2: firefox 88.0+build2-0ubuntu0.18.04.2 for Ubuntu 18.04.6 LTS (bionic)

firefox 88.0+build2-0ubuntu0.18.04.2, released April 25, 2021, fixes 12 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-88.0-build2-0ubuntu0.18.04.2
- Platform: Linux
- Released: Apr 25, 2021
- Priority: High (Closes CVE-2021-23994, high severity)
- CVEs: 12, 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) | 88.0+build2-0ubuntu0.18.04.2 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2021-23994](https://patchblox.com/security/data/cve/CVE-2021-23994.md) | High | Firefox ESR and 2 others: A WebGL framebuffer was not initialized early enough, resulting in memory corruption and an out of bound… | 8.8 | 0.0176 |  |
| [CVE-2021-23999](https://patchblox.com/security/data/cve/CVE-2021-23999.md) | High | Firefox ESR and 2 others: If a Blob URL was loaded through some unusual user interaction, it could have been loaded by the System… | 8.8 | 0.0137 |  |
| [CVE-2021-29946](https://patchblox.com/security/data/cve/CVE-2021-29946.md) | High | Firefox ESR and 2 others: Ports that were written as an integer overflow above the bounds of a 16-bit integer could have bypassed… | 8.8 | 0.0130 |  |
| [CVE-2021-23995](https://patchblox.com/security/data/cve/CVE-2021-23995.md) | High | Firefox ESR and 2 others: When Responsive Design Mode was enabled, it used references to objects that were previously freed. | 8.8 | 0.0118 |  |
| [CVE-2021-24002](https://patchblox.com/security/data/cve/CVE-2021-24002.md) | High | Firefox ESR and 2 others: When a user clicked on an FTP URL containing encoded newline characters (%0A and %0D), the newlines would… | 8.8 | 0.0113 |  |
| [CVE-2021-29947](https://patchblox.com/security/data/cve/CVE-2021-29947.md) | High | Firefox ESR and 1 other: Mozilla developers and community members reported memory safety bugs present in Firefox 87. | 8.8 | 0.0087 |  |
| [CVE-2021-23997](https://patchblox.com/security/data/cve/CVE-2021-23997.md) | High | Firefox ESR and 1 other: Due to unexpected data type conversions, a use-after-free could have occurred when interacting with the… | 8.8 | 0.0082 |  |
| [CVE-2021-29945](https://patchblox.com/security/data/cve/CVE-2021-29945.md) | Routine | Firefox ESR and 2 others: The WebAssembly JIT could miscalculate the size of a return type, which could lead to a null read and… | 6.5 | 0.0120 |  |
| [CVE-2021-23996](https://patchblox.com/security/data/cve/CVE-2021-23996.md) | Routine | Firefox ESR and 1 other: By utilizing 3D CSS in conjunction with Javascript, content could have been rendered outside the webpage's… | 6.5 | 0.0072 |  |
| [CVE-2021-24000](https://patchblox.com/security/data/cve/CVE-2021-24000.md) | Routine | Firefox ESR and 1 other: A race condition with requestPointerLock() and setTimeout() could have resulted in a user interacting… | 3.1 | 0.0061 |  |
| [CVE-2021-23998](https://patchblox.com/security/data/cve/CVE-2021-23998.md) | Routine | Firefox ESR and 2 others: Through complicated navigations with new windows, an HTTP page could have inherited a secure lock icon… | 6.5 | 0.0059 |  |
| [CVE-2021-24001](https://patchblox.com/security/data/cve/CVE-2021-24001.md) | Routine | Firefox ESR and 1 other: A compromised content process could have performed session history manipulations it should not have been… | 4.3 | 0.0057 |  |

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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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