# ELSA-2021-0618: stunnel security update

ELSA-2021-0618, released February 23, 2021, fixes 1 CVE in stunnel (version 0:5.56-5.el8_3). None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/elsa-2021-0618
- Platform: Linux
- Released: Feb 23, 2021
- Priority: High (Closes CVE-2021-20230, high severity)
- CVEs: 1, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://linux.oracle.com/errata/ELSA-2021-0618.html

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [stunnel](https://patchblox.com/security/data/product/linux/stunnel.md) | ol 8 | 0:5.56-5.el8_3 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2021-20230](https://patchblox.com/security/data/cve/CVE-2021-20230.md) | High | stunnel: Stunnel is a wrapper for network connections | 7.5 | 0.0118 |  |

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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo