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Fencer Vulns
high 8.1

CVE-2016-5387 in the critical feed json

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 untr…

published 2016-07-19 10 y ago modified 2026-06-17 4 mo ago also EUVD-2016-6337

cvss
8.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
55.7%
EPSS 55.7% chance of exploitation in 30 days, percentile 99%
public exploits
0
none known

Summary

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.

Patch / fix

  • apache2 Debian 14, Debian 13, Debian 12 2.4.23-2

debian advisories DEBIAN-CVE-2016-5387

  • apache2 Ubuntu 14.04 LTS 2.4.7-1ubuntu4.13
  • apache2 Ubuntu 16.04 LTS 2.4.18-2ubuntu3.1

ubuntu advisories UBUNTU-CVE-2016-5387

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • httpd24 jboss enterprise web server 3.0 2.4.6-62.ep7.el6
  • tomcat7 jboss enterprise web server 3.0 7.0.59-51_patch_01.ep7.el6
  • tomcat8 jboss enterprise web server 3.0 8.0.18-62_patch_01.ep7.el6
  • mod_ssl24 jboss enterprise web server 3.0 1:2.4.6-62.ep7.el6
  • mod_ldap24 jboss enterprise web server 3.0 2.4.6-62.ep7.el6
  • tomcat7-lib jboss enterprise web server 3.0 7.0.59-51_patch_01.ep7.el6
  • tomcat8-lib jboss enterprise web server 3.0 8.0.18-62_patch_01.ep7.el6
  • httpd24-tools jboss enterprise web server 3.0 2.4.6-62.ep7.el6

red hat advisories RHSA-2016:1636RHSA-2016:1635RHSA-2016:1649RHSA-2016:1648RHSA-2016:1851RHSA-2016:1420

  • apache2 Studio Onsite 1.3, SLES for SAP 11 SP4, SLES 11 SP4 +1 more 2.2.12-64.1
  • apache2 SLES for SAP 12 SP1, SLES 12 SP1, SLE Software Development Kit 12 SP1 2.4.16-7.1
  • apache2 SLES for SAP 12, SLES 12-LTSS 2.4.10-14.17.1

suse advisories SUSE-SU-2016:2090-1SUSE-SU-2016:1819-1SUSE-SU-2016:1818-1

  • apache2 openSUSE Tumbleweed 2.4.49-1.1

opensuse advisories openSUSE-SU-2024:10623-1

  • apache2 Alpine 3.4 2.4.23-r1

alpine advisories ALPINE-CVE-2016-5387

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2016-5387 updated cvss 5.0

HTTPD: sets environmental variable based on user supplied Proxy request header

  • Red Hat JBoss Enterprise Application Platform 6 httpd22 httpd22
    affected: no fix available
  • Red Hat JBoss Enterprise Web Server 1 httpd
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux (v. 5 server) httpd 2.2.3-92.el5_11, mod_ssl 2.2.3-92.el5_11, httpd-manual 2.2.3-92.el5_11
    fixed: vendor fix RHSA-2016:1421
  • Red Hat Enterprise Linux Client Optional (v. 7) httpd 2.4.6-40.el7_2.4, mod_ssl 2.4.6-40.el7_2.4, mod_ldap 2.4.6-40.el7_2.4, httpd-tools 2.4.6-40.el7_2.4, mod_session 2.4.6-40.el7_2.4, httpd-manual 2.4.6-40.el7_2.4, +1 more Red Hat Enterprise Linux ComputeNode Optional (v. 7) httpd 2.4.6-40.el7_2.4, mod_ssl 2.4.6-40.el7_2.4, mod_ldap 2.4.6-40.el7_2.4, httpd-tools 2.4.6-40.el7_2.4, mod_session 2.4.6-40.el7_2.4, httpd-manual 2.4.6-40.el7_2.4, +1 more
    fixed: vendor fix RHSA-2016:1422
  • Red Hat Enterprise Linux Desktop (v. 5 client) httpd 2.2.3-92.el5_11, mod_ssl 2.2.3-92.el5_11 Red Hat Enterprise Linux Desktop (v. 6) httpd 2.2.15-54.el6_8, httpd-tools 2.2.15-54.el6_8 Red Hat Enterprise Linux Desktop Optional (v. 6) mod_ssl 2.2.15-54.el6_8, httpd-manual 2.2.15-54.el6_8 Red Hat Enterprise Linux Desktop Workstation (v. 5 client) httpd 2.2.3-92.el5_11, httpd-manual 2.2.3-92.el5_11 Red Hat Enterprise Linux HPC Node (v. 6) httpd 2.2.15-54.el6_8, httpd-tools 2.2.15-54.el6_8 Red Hat Enterprise Linux HPC Node Optional (v. 6) mod_ssl 2.2.15-54.el6_8, httpd-manual 2.2.15-54.el6_8
    +1 more products
    Red Hat Enterprise Linux Server (v. 6) httpd 2.2.15-54.el6_8, mod_ssl 2.2.15-54.el6_8, httpd-tools 2.2.15-54.el6_8, httpd-manual 2.2.15-54.el6_8
    fixed: vendor fix RHSA-2016:1421
  • Red Hat Enterprise Linux Server (v. 7) httpd 2.4.6-40.el7_2.4, mod_ssl 2.4.6-40.el7_2.4, httpd-tools 2.4.6-40.el7_2.4, httpd-manual 2.4.6-40.el7_2.4 Red Hat Enterprise Linux Server Optional (v. 7) mod_ldap 2.4.6-40.el7_2.4, mod_session 2.4.6-40.el7_2.4, mod_proxy_html 2.4.6-40.el7_2.4
    fixed: vendor fix RHSA-2016:1422
  • Red Hat Enterprise Linux Workstation (v. 6) httpd 2.2.15-54.el6_8, mod_ssl 2.2.15-54.el6_8, httpd-tools 2.2.15-54.el6_8, httpd-manual 2.2.15-54.el6_8
    fixed: vendor fix RHSA-2016:1421
  • Red Hat Enterprise Linux Workstation (v. 7) httpd 2.4.6-40.el7_2.4, mod_ssl 2.4.6-40.el7_2.4, httpd-tools 2.4.6-40.el7_2.4, httpd-manual 2.4.6-40.el7_2.4 Red Hat Enterprise Linux Workstation Optional (v. 7) mod_ldap 2.4.6-40.el7_2.4, mod_session 2.4.6-40.el7_2.4, mod_proxy_html 2.4.6-40.el7_2.4
    fixed: vendor fix RHSA-2016:1422
show 10 more
  • Red Hat JBoss Core Services
    fixed: vendor fix RHSA-2016:1625
  • Red Hat JBoss Core Services on RHEL 6 Server jbcs-httpd24-httpd 2.4.6-77.SP1.jbcs.el6, jbcs-httpd24-mod_ssl 2.4.6-77.SP1.jbcs.el6, jbcs-httpd24-mod_ldap 2.4.6-77.SP1.jbcs.el6, jbcs-httpd24-httpd-zip 2.4.6-77.SP1.jbcs.el6, jbcs-httpd24-httpd-tools 2.4.6-77.SP1.jbcs.el6, jbcs-httpd24-mod_session 2.4.6-77.SP1.jbcs.el6, +3 more Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-httpd 2.4.6-77.SP1.jbcs.el7, jbcs-httpd24-mod_ssl 2.4.6-77.SP1.jbcs.el7, jbcs-httpd24-mod_ldap 2.4.6-77.SP1.jbcs.el7, jbcs-httpd24-httpd-zip 2.4.6-77.SP1.jbcs.el7, jbcs-httpd24-httpd-tools 2.4.6-77.SP1.jbcs.el7, jbcs-httpd24-mod_session 2.4.6-77.SP1.jbcs.el7, +3 more
    fixed: vendor fix RHSA-2016:1851
  • Red Hat JBoss Enterprise Web Server 2 for RHEL 6 Server httpd 2.2.26-54.ep6.el6, jbcs-httpd24 1-3.jbcs.el6, mod_ssl 2.2.26-54.ep6.el6, httpd-tools 2.2.26-54.ep6.el6, httpd-manual 2.2.26-54.ep6.el6, mod_jk 1.2.41-2.redhat_3.ep6.el6, +11 more
    fixed: vendor fix RHSA-2016:1649
  • Red Hat JBoss Enterprise Web Server 2 for RHEL 7 Server httpd22 2.2.26-56.ep6.el7, jbcs-httpd24 1-3.jbcs.el7, mod_ssl22 2.2.26-56.ep6.el7, httpd22-tools 2.2.26-56.ep6.el7, httpd22-manual 2.2.26-56.ep6.el7, mod_jk 1.2.41-2.redhat_3.ep6.el7, +11 more
    fixed: vendor fix RHSA-2016:1648
  • Red Hat JBoss Web Server 2.1
    fixed: vendor fix RHSA-2016:1650
  • Red Hat JBoss Web Server 3.0
    fixed: vendor fix RHSA-2016:1624
  • Red Hat JBoss Web Server 3.0 for RHEL 6 httpd24 2.4.6-62.ep7.el6, mod_ssl24 2.4.6-62.ep7.el6, mod_ldap24 2.4.6-62.ep7.el6, httpd24-tools 2.4.6-62.ep7.el6, mod_session24 2.4.6-62.ep7.el6, httpd24-manual 2.4.6-62.ep7.el6, +21 more
    fixed: vendor fix RHSA-2016:1636
  • Red Hat JBoss Web Server 3.0 for RHEL 7 httpd24 2.4.6-62.ep7.el7, mod_ssl24 2.4.6-62.ep7.el7, mod_ldap24 2.4.6-62.ep7.el7, httpd24-tools 2.4.6-62.ep7.el7, mod_session24 2.4.6-62.ep7.el7, httpd24-manual 2.4.6-62.ep7.el7, +21 more
    fixed: vendor fix RHSA-2016:1635
  • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6) httpd24-httpd 2.4.18-11.el6, httpd24-mod_ssl 2.4.18-11.el6, httpd24-mod_ldap 2.4.18-11.el6, httpd24-httpd-tools 2.4.18-11.el6, httpd24-mod_session 2.4.18-11.el6, httpd24-httpd-manual 2.4.18-11.el6, +1 more Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) httpd24-httpd 2.4.18-11.el7, httpd24-mod_ssl 2.4.18-11.el7, httpd24-mod_ldap 2.4.18-11.el7, httpd24-httpd-tools 2.4.18-11.el7, httpd24-mod_session 2.4.18-11.el7, httpd24-httpd-manual 2.4.18-11.el7, +1 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 6.6) httpd24-httpd 2.4.18-11.el6, httpd24-mod_ssl 2.4.18-11.el6, httpd24-mod_ldap 2.4.18-11.el6, httpd24-httpd-tools 2.4.18-11.el6, httpd24-mod_session 2.4.18-11.el6, httpd24-httpd-manual 2.4.18-11.el6, +1 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 6.7) httpd24-httpd 2.4.18-11.el6, httpd24-mod_ssl 2.4.18-11.el6, httpd24-mod_ldap 2.4.18-11.el6, httpd24-httpd-tools 2.4.18-11.el6, httpd24-mod_session 2.4.18-11.el6, httpd24-httpd-manual 2.4.18-11.el6, +1 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.1) httpd24-httpd 2.4.18-11.el7, httpd24-mod_ssl 2.4.18-11.el7, httpd24-mod_ldap 2.4.18-11.el7, httpd24-httpd-tools 2.4.18-11.el7, httpd24-mod_session 2.4.18-11.el7, httpd24-httpd-manual 2.4.18-11.el7, +1 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.2) httpd24-httpd 2.4.18-11.el7, httpd24-mod_ssl 2.4.18-11.el7, httpd24-mod_ldap 2.4.18-11.el7, httpd24-httpd-tools 2.4.18-11.el7, httpd24-mod_session 2.4.18-11.el7, httpd24-httpd-manual 2.4.18-11.el7, +1 more
    +2 more products
    Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 6) httpd24-httpd 2.4.18-11.el6, httpd24-mod_ssl 2.4.18-11.el6, httpd24-mod_ldap 2.4.18-11.el6, httpd24-httpd-tools 2.4.18-11.el6, httpd24-mod_session 2.4.18-11.el6, httpd24-httpd-manual 2.4.18-11.el6, +1 more Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) httpd24-httpd 2.4.18-11.el7, httpd24-mod_ssl 2.4.18-11.el7, httpd24-mod_ldap 2.4.18-11.el7, httpd24-httpd-tools 2.4.18-11.el7, httpd24-mod_session 2.4.18-11.el7, httpd24-httpd-manual 2.4.18-11.el7, +1 more
    fixed: vendor fix RHSA-2016:1420
  • Red Hat JBoss Enterprise Application Platform 7 httpd
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

55.72% chance of exploitation in the next 30 days, higher than 99% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Classification

Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.