CVE-2016-5388: Apache Tomcat

High severity, CVSS 8.1. EPSS: 50.9% chance of exploitation in the next 30 days.

Apache Tomcat 7.x through 7.0.70 and 8.x through 8.5.4, when the CGI Servlet is enabled, follows RFC 3875 section 4.1.18 and therefore does not protect applications from the presence of untrusted client data in the HTTP_PROXY environment variable, which might allow remote attackers to redirect an application's outbound HTTP traffic to an arbitrary proxy server via a crafted Proxy header in an HTTP request, aka an "httpoxy" issue. NOTE: the vendor states "A mitigation is planned for future releases of Tomcat, tracked as CVE-2016-5388"; in other words, this is not a CVE ID for a vulnerability.

Affected products

• Apache Tomcat: from 6.0, up to and including 6.0.45; from 7.0, up to and including 7.0.70; from 8.0, up to and including 8.5.4
• HP System Management Homepage: up to and including 7.5.5.0
• Oracle Linux: version 6 only; version 7 only
• Red Hat Enterprise Linux Desktop: version 7.0 only; version 6.0 only
• Red Hat Enterprise Linux Hpc Node: version 7.0 only; version 6.0 only
• Red Hat Enterprise Linux Hpc Node Eus: version 7.2 only
• Red Hat Enterprise Linux Server: version 7.0 only; version 6.0 only
• Red Hat Enterprise Linux Server Aus: version 7.2 only
• Red Hat Enterprise Linux Server Eus: version 7.2 only
• Red Hat Enterprise Linux Server Tus: version 7.2 only
• Red Hat Enterprise Linux Workstation: version 7.0 only; version 6.0 only

Published 2016-07-19. Last modified 2026-06-17.