# RHSA-2023:5433: firefox security update

RHSA-2023:5433, released October 4, 2023, fixes 5 CVEs in firefox (version 0:115.3.1-1.el8_8). One of them is being exploited (CVE-2023-5217); 1 on CISA KEV. Patch Radar priority: Patch now.

- Web page: https://patchblox.com/security/fix/linux/rhsa-2023-5433
- Platform: Linux
- Released: Oct 4, 2023
- Priority: Patch now (Closes CVE-2023-5217, exploited (CISA KEV))
- CVEs: 5, exploited: 1, on CISA KEV: 1
- Vendor advisory: https://access.redhat.com/errata/RHSA-2023:5433

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [firefox](https://patchblox.com/security/data/product/linux/firefox.md) | RHEL 8 | 0:115.3.1-1.el8_8 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2023-5217](https://patchblox.com/security/data/cve/CVE-2023-5217.md) | Patch now | Chromium: CVE-2023-5217 Heap buffer overflow in vp8 encoding in libvpx | 8.8 | 0.4901 | CISA KEV, Disclosed |
| [CVE-2023-5176](https://patchblox.com/security/data/cve/CVE-2023-5176.md) | Urgent | Mozilla Firefox ESR and 5 others: Out-of-bounds Write | 9.8 | 0.0139 |  |
| [CVE-2023-3600](https://patchblox.com/security/data/cve/CVE-2023-3600.md) | High | Use-after-free in workers | 8.8 | 0.0063 |  |
| [CVE-2023-5171](https://patchblox.com/security/data/cve/CVE-2023-5171.md) | Routine | Mozilla Firefox ESR and 5 others: During Ion compilation, a Garbage Collection could have resulted in a use-after-free condition, allowing… | 6.5 | 0.0112 |  |
| [CVE-2023-5169](https://patchblox.com/security/data/cve/CVE-2023-5169.md) | Routine | Mozilla Firefox ESR and 5 others: A compromised content process could have provided malicious data in a `PathRecording` resulting in an… | 6.5 | 0.0110 |  |

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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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo