# RHSA-2023:7500: thunderbird security update

RHSA-2023:7500, released November 27, 2023, fixes 7 CVEs in thunderbird (version 0:115.5.0-1.el8_9). None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/rhsa-2023-7500
- Platform: Linux
- Released: Nov 27, 2023
- Priority: High (Closes CVE-2023-6212, high severity)
- CVEs: 7, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://access.redhat.com/errata/RHSA-2023:7500

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [thunderbird](https://patchblox.com/security/data/product/linux/thunderbird.md) | RHEL 8 | 0:115.5.0-1.el8_9 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2023-6212](https://patchblox.com/security/data/cve/CVE-2023-6212.md) | High | Mozilla Firefox ESR and 5 others: Memory safety bugs present in Firefox 119, Firefox ESR 115.4, and Thunderbird 115.4. | 8.8 | 0.0095 |  |
| [CVE-2023-6207](https://patchblox.com/security/data/cve/CVE-2023-6207.md) | High | Mozilla Firefox ESR and 5 others: Ownership mismanagement led to a use-after-free in ReadableByteStreams This vulnerability affects Firefox… | 8.8 | 0.0091 |  |
| [CVE-2023-6208](https://patchblox.com/security/data/cve/CVE-2023-6208.md) | High | Mozilla Firefox ESR and 5 others: When using X11, text selected by the page using the Selection API was erroneously copied into the primary… | 8.8 | 0.0089 |  |
| [CVE-2023-6205](https://patchblox.com/security/data/cve/CVE-2023-6205.md) | High | Mozilla Firefox ESR and 5 others: It was possible to cause the use of a MessagePort after it had already been freed, which could potentially… | 7.5 | 0.0087 |  |
| [CVE-2023-6204](https://patchblox.com/security/data/cve/CVE-2023-6204.md) | High | Mozilla Firefox ESR and 5 others: On some systems—depending on the graphics settings and drivers—it was possible to force an out-of-bounds… | 7.5 | 0.0084 |  |
| [CVE-2023-6206](https://patchblox.com/security/data/cve/CVE-2023-6206.md) | High | Mozilla Firefox ESR and 5 others: The black fade animation when exiting fullscreen is roughly the length of the anti-clickjacking delay… | 7.5 | 0.0064 |  |
| [CVE-2023-6209](https://patchblox.com/security/data/cve/CVE-2023-6209.md) | Routine | Mozilla Firefox ESR and 5 others: Relative URLs starting with three slashes were incorrectly parsed, and a path-traversal "/../" part in… | 6.5 | 0.0142 |  |

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Data as of 2026-11-07T12:40:37Z 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