CVE-2021-40438

Updated: 2025-12-14 02:18:19.295145

Description:

A crafted request uri-path can cause mod_proxy to forward the request to an origin server choosen by the remote user. This issue affects Apache HTTP Server 2.4.48 and earlier.


Links NIST CIRCL RHEL Ubuntu

Severity

Severity Score
CVSS Version 2.x MEDIUM 6.8
CVSS Version 3.x CRITICAL 9.0

Known exploits

Added Date Description Due Date Notes
2021-12-01 A crafted request uri-path can cause mod_proxy to forward the request to an origin server choosen by the remote user. This issue affects Apache HTTP Server 2.4.48 and earlier. 2021-12-15 https://nvd.nist.gov/vuln/detail/CVE-2021-40438

Status

OS name Project name Version Score Severity Status Errata Last updated

Statement
CentOS 6 ELS httpd 2.2.15 9.0 CRITICAL Not Vulnerable 2022-04-19 21:49:51 Our resolution: https://bit.ly/3EAaIV6
CentOS 7 ELS httpd 2.4.6 9.0 CRITICAL Already Fixed 2023-09-19 09:30:25 Our resolution: https://bit.ly/3EAaIV6
CentOS 8.4 ELS httpd 2.4.37 9.0 CRITICAL Released CLSA-2022:1643747448 2022-04-19 21:49:51 Our resolution: https://bit.ly/3EAaIV6
CentOS 8.5 ELS httpd 2.4.37 9.0 CRITICAL Already Fixed 2023-10-27 11:24:19 Our resolution: https://bit.ly/3EAaIV6
CentOS Stream 8 ELS httpd 2.4.37 9.0 CRITICAL Already Fixed 2024-05-15 10:22:52 Our resolution: https://bit.ly/3EAaIV6
CloudLinux 6 ELS httpd 2.2.15 9.0 CRITICAL Not Vulnerable 2022-04-19 21:49:51 Our resolution: https://bit.ly/3EAaIV6
CloudLinux 7 ELS httpd 2.4.6 9.0 CRITICAL Already Fixed 2024-07-23 11:58:29 Our resolution: https://bit.ly/3EAaIV6
Oracle Linux 6 ELS httpd 2.2.15 9.0 CRITICAL Not Vulnerable 2022-04-19 21:49:51 Our resolution: https://bit.ly/3EAaIV6
Oracle Linux 7 ELS httpd 2.4.6 9.0 CRITICAL Already Fixed 2024-12-03 12:09:58
RHEL 7 ELS httpd 2.4.6 9.0 CRITICAL Released CLSA-2025:1748638011 2025-06-02 16:07:06
Total: 12