CVE-2016-4975: Apache HTTP Server

Medium severity, CVSS 6.1. EPSS: 19.8% chance of exploitation in the next 30 days.

Possible CRLF injection allowing HTTP response splitting attacks for sites which use mod_userdir. This issue was mitigated by changes made in 2.4.25 and 2.2.32 which prohibit CR or LF injection into the "Location" or other outbound header key or value. Fixed in Apache HTTP Server 2.4.25 (Affected 2.4.1-2.4.23). Fixed in Apache HTTP Server 2.2.32 (Affected 2.2.0-2.2.31).

Affected products

• Apache HTTP Server: version 2.2.0 only; version 2.2.2 only; version 2.2.3 only; version 2.2.4 only; version 2.2.6 only; version 2.2.8 only; …

Published 2018-08-14. Last modified 2026-06-17.