Vulnerability Database

328,409

Total vulnerabilities in the database

CVE-2016-5387

The Apache HTTP Server through 2.4.23 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 "This mitigation has been assigned the identifier CVE-2016-5387"; in other words, this is not a CVE ID for a vulnerability.

  • Published: Jul 19, 2016
  • Updated: Nov 9, 2025
  • CVE: CVE-2016-5387
  • Severity: High
  • Exploit:

CVSS v3:

  • Severity: High
  • Score: 8.1
  • AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v2:

  • Severity: Medium
  • Score: 6.8
  • AV:N/AC:M/Au:N/C:P/I:P/A:P

No CWE or OWASP classifications available.

Software From Fixed in
apache / http_server 2.4.1 2.4.23.x
apache / http_server 2.2.0 2.2.31.x
hp / system_management_homepage - 7.5.5.0.x
oracle / enterprise_manager_ops_center 12.2.2 12.2.2.x
oracle / solaris 11.3 11.3.x
oracle / enterprise_manager_ops_center 12.3.2 12.3.2.x
oracle / linux 5 5.x
oracle / linux 6 6.x
oracle / linux 7 7.x
oracle / communications_user_data_repository 10.0.0 12.4.x
fedoraproject / fedora 24 24.x
fedoraproject / fedora 23 23.x
redhat / jboss_web_server 2.1.0 2.1.0.x
redhat / jboss_enterprise_web_server 2.0.0 2.0.0.x
redhat / jboss_enterprise_web_server 3.0.0 3.0.0.x
redhat / jboss_core_services 1.0 1.0.x
redhat / enterprise_linux_desktop 7.0 7.0.x
redhat / enterprise_linux_server_aus 7.2 7.2.x
redhat / enterprise_linux_workstation 7.0 7.0.x
redhat / enterprise_linux_server_tus 7.2 7.2.x
redhat / enterprise_linux_server 7.0 7.0.x
redhat / enterprise_linux_desktop 6.0 6.0.x
redhat / enterprise_linux_server 6.0 6.0.x
redhat / enterprise_linux_workstation 6.0 6.0.x
redhat / enterprise_linux_server_tus 7.3 7.3.x
redhat / enterprise_linux_server_aus 7.3 7.3.x
redhat / enterprise_linux_server_aus 7.4 7.4.x
redhat / enterprise_linux_eus 7.3 7.3.x
redhat / enterprise_linux_eus 7.4 7.4.x
redhat / enterprise_linux_eus 7.5 7.5.x
redhat / enterprise_linux_server_tus 7.6 7.6.x
redhat / enterprise_linux_server_aus 7.6 7.6.x
redhat / enterprise_linux_eus 7.6 7.6.x
redhat / enterprise_linux_eus 7.2 7.2.x
redhat / enterprise_linux_server_aus 7.7 7.7.x
redhat / enterprise_linux_server_tus 7.7 7.7.x
redhat / enterprise_linux_eus 7.7 7.7.x
debian / debian_linux 8.0 8.0.x
canonical / ubuntu_linux 15.10 15.10.x
canonical / ubuntu_linux 14.04 14.04.x
canonical / ubuntu_linux 16.04 16.04.x
canonical / ubuntu_linux 12.04 12.04.x
opensuse / leap 42.1 42.1.x
opensuse / opensuse 13.2 13.2.x

Frequently Asked Questions

A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.

Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.

Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.

SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.