# RHSA-2021:1193: thunderbird security update

RHSA-2021:1193, released April 14, 2021, fixes 5 CVEs in thunderbird (version 0:78.9.1-1.el8_3). None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/rhsa-2021-1193
- Platform: Linux
- Released: Apr 14, 2021
- Priority: High (Closes CVE-2021-29950, high severity)
- CVEs: 5, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://access.redhat.com/errata/RHSA-2021:1193

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [thunderbird](https://patchblox.com/security/data/product/linux/thunderbird.md) | RHEL 8 | 0:78.9.1-1.el8_3 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2021-29950](https://patchblox.com/security/data/cve/CVE-2021-29950.md) | High | Thunderbird: Thunderbird unprotects a secret OpenPGP key prior to using it for a decryption, signing or key import… | 7.5 | 0.0085 |  |
| [CVE-2021-29949](https://patchblox.com/security/data/cve/CVE-2021-29949.md) | High | Thunderbird: When loading the shared library that provides the OTR protocol implementation, Thunderbird will initially… | 7.8 | 0.0032 |  |
| [CVE-2021-23991](https://patchblox.com/security/data/cve/CVE-2021-23991.md) | Routine | Thunderbird: If a Thunderbird user has previously imported Alice's OpenPGP key, and Alice has extended the validity… | 6.8 | 0.0104 |  |
| [CVE-2021-23992](https://patchblox.com/security/data/cve/CVE-2021-23992.md) | Routine | Thunderbird: Thunderbird did not check if the user ID associated with an OpenPGP key has a valid self signature. | 4.3 | 0.0048 |  |
| [CVE-2021-23993](https://patchblox.com/security/data/cve/CVE-2021-23993.md) | Routine | Thunderbird: An attacker may perform a DoS attack to prevent a user from sending encrypted email to a correspondent. | 6.5 | 0.0042 |  |

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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo