CVE Database›Document archive›CVE-2021-44224

CVE-2021-44224

httpd: possible NULL dereference or SSRF in forward proxy configurations

Loading…

Severity

Moderate

Red Hat Product Security

7.1

CVSS 3.1

Review impact separately from score.

Published · December 20, 2021

Updated · November 2, 2026

Description

There's a null pointer dereference and server-side request forgery flaw in httpd's mod_proxy module, when it is configured to be used as a forward proxy. A crafted packet could be sent on the adjacent network to the forward proxy that could cause a crash, or potentially SSRF via misdirected Unix Domain Socket requests. In the worst case, this could cause a denial of service or compromise to confidentiality of data.

Statement

This flaw does not affect httpd configurations that do not use forward proxy functionality (configurations where ProxyRequests is turned off).

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

CVSS / CWE

CVSS 3.1 · 7.1
CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:H

CWE-918 · Server-Side Request Forgery