# RHSA-2020:1495: thunderbird security update

RHSA-2020:1495, released April 16, 2020, fixes 5 CVEs in thunderbird (version 0:68.7.0-1.el8_1). 2 of them are being exploited (CVE-2020-6820); 2 on CISA KEV. Patch Radar priority: Patch now.

- Web page: https://patchblox.com/security/fix/linux/rhsa-2020-1495
- Platform: Linux
- Released: Apr 16, 2020
- Priority: Patch now (Closes CVE-2020-6820, exploited (CISA KEV))
- CVEs: 5, exploited: 2, on CISA KEV: 2
- Vendor advisory: https://access.redhat.com/errata/RHSA-2020:1495

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [thunderbird](https://patchblox.com/security/data/product/linux/thunderbird.md) | RHEL 8 | 0:68.7.0-1.el8_1 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2020-6820](https://patchblox.com/security/data/cve/CVE-2020-6820.md) | Patch now | Mozilla Firefox And Thunderbird Use-After-Free Vulnerability | 8.8 | 0.0706 | CISA KEV |
| [CVE-2020-6819](https://patchblox.com/security/data/cve/CVE-2020-6819.md) | Patch now | Mozilla Firefox And Thunderbird Use-After-Free Vulnerability | 8.8 | 0.0304 | CISA KEV |
| [CVE-2020-6825](https://patchblox.com/security/data/cve/CVE-2020-6825.md) | High | Firefox ESR: Mozilla developers and community members Tyson Smith and Christian Holler reported memory safety bugs… | 9.8 | 0.0219 |  |
| [CVE-2020-6821](https://patchblox.com/security/data/cve/CVE-2020-6821.md) | High | Firefox ESR: When reading from areas partially or fully outside the source resource with WebGL's <code>copyTexSubImage</code>… | 7.5 | 0.0151 |  |
| [CVE-2020-6822](https://patchblox.com/security/data/cve/CVE-2020-6822.md) | High | Firefox ESR: On 32-bit builds, an out of bounds write could have occurred when processing an image larger than 4 GB… | 8.8 | 0.0133 |  |

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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo