# RHSA-2021:1809: Security update for 11 packages

RHSA-2021:1809, released May 18, 2021, fixes 3 CVEs across 11 products. None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/rhsa-2021-1809
- Platform: Linux
- Released: May 18, 2021
- Priority: High (Closes CVE-2020-11984, high severity)
- CVEs: 3, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://access.redhat.com/errata/RHSA-2021:1809

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [httpd](https://patchblox.com/security/data/product/linux/httpd.md) | RHEL 8 | 0:2.4.37-39.module+el8.4.0+9658+b87b2deb |
| [httpd-devel](https://patchblox.com/security/data/product/linux/httpd-devel.md) | RHEL 8 | 0:2.4.37-39.module+el8.4.0+9658+b87b2deb |
| [httpd-filesystem](https://patchblox.com/security/data/product/linux/httpd-filesystem.md) | RHEL 8 | 0:2.4.37-39.module+el8.4.0+9658+b87b2deb |
| [httpd-manual](https://patchblox.com/security/data/product/linux/httpd-manual.md) | RHEL 8 | 0:2.4.37-39.module+el8.4.0+9658+b87b2deb |
| [httpd-tools](https://patchblox.com/security/data/product/linux/httpd-tools.md) | RHEL 8 | 0:2.4.37-39.module+el8.4.0+9658+b87b2deb |
| [mod_http2](https://patchblox.com/security/data/product/linux/mod-http2.md) | RHEL 8 | 0:1.15.7-3.module+el8.4.0+8625+d397f3da |
| [mod_ldap](https://patchblox.com/security/data/product/linux/mod-ldap.md) | RHEL 8 | 0:2.4.37-39.module+el8.4.0+9658+b87b2deb |
| [mod_md](https://patchblox.com/security/data/product/linux/mod-md.md) | RHEL 8 | 1:2.0.8-8.module+el8.3.0+6814+67d1e611 |
| [mod_proxy_html](https://patchblox.com/security/data/product/linux/mod-proxy-html.md) | RHEL 8 | 1:2.4.37-39.module+el8.4.0+9658+b87b2deb |
| [mod_session](https://patchblox.com/security/data/product/linux/mod-session.md) | RHEL 8 | 0:2.4.37-39.module+el8.4.0+9658+b87b2deb |
| [mod_ssl](https://patchblox.com/security/data/product/linux/mod-ssl.md) | RHEL 8 | 1:2.4.37-39.module+el8.4.0+9658+b87b2deb |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2020-11984](https://patchblox.com/security/data/cve/CVE-2020-11984.md) | High | uwsgi-infrastructure-plugins: Apache HTTP server 2.4.32 to 2.4.44 mod_proxy_uwsgi info disclosure and possible RCE | 9.8 | 0.9004 |  |
| [CVE-2020-11993](https://patchblox.com/security/data/cve/CVE-2020-11993.md) | High | httpd: The httpd packages provide the Apache HTTP Server, a powerful, efficient, and extensible web server.  Security Fix(es... | 7.5 | 0.5660 |  |
| [CVE-2018-17199](https://patchblox.com/security/data/cve/CVE-2018-17199.md) | High | mod_md: The httpd packages provide the Apache HTTP Server, a powerful, efficient, and extensible web server.  Security Fix(es... | 7.5 | 0.1999 |  |

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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