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Fencer Vulns
medium 5.3

CVE-2018-1283 json

In Apache httpd 2.4.0 to 2.4.29, when mod_session is configured to forward its session data to CGI applications (SessionEnv on, not the def…

published 2018-03-26 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-11901

cvss
5.3
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
9.7%
EPSS 9.7% chance of exploitation in 30 days, percentile 95%
public exploits
0
none known

Summary

In Apache httpd 2.4.0 to 2.4.29, when mod_session is configured to forward its session data to CGI applications (SessionEnv on, not the default), a remote user may influence their content by using a "Session" header. This comes from the "HTTP_SESSION" variable name used by mod_session to forward its data to CGIs, since the prefix "HTTP_" is also used by the Apache HTTP Server to pass HTTP header fields, per CGI specifications.

Patch / fix

  • apache2 Debian 14, Debian 13, Debian 12 2.4.33-1

debian advisories DEBIAN-CVE-2018-1283

  • apache2 Ubuntu 14.04 LTS 2.4.7-1ubuntu4.20
  • apache2 Ubuntu 16.04 LTS 2.4.18-2ubuntu3.8
  • apache2 Ubuntu 18.04 LTS 2.4.29-1ubuntu4.1

ubuntu advisories UBUNTU-CVE-2018-1283

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

  • httpd RHEL 7 2.4.6-95.el7
  • mod_ssl RHEL 7 1:2.4.6-95.el7
  • mod_ldap RHEL 7 2.4.6-95.el7
  • httpd-tools RHEL 7 2.4.6-95.el7
  • mod_session RHEL 7 2.4.6-95.el7
  • httpd-manual RHEL 7 2.4.6-95.el7
  • mod_proxy_html RHEL 7 1:2.4.6-95.el7
  • jbcs-httpd24 jboss core services 1 1-6.jbcs.el6

red hat advisories RHSA-2020:3958RHSA-2019:0367RHSA-2018:3558

  • apache2 SLES 12 SP3, SLES 12 SP2-BCL, SLE Software Development Kit 12 SP3 +4 more 2.4.23-29.18.2
  • apache2 SLES for SAP 12 SP1, SLES 12 SP1-LTSS, OpenStack Cloud 6 2.4.16-20.16.1
  • apache2 SLES 12-LTSS 2.4.10-14.31.1

suse advisories SUSE-SU-2018:1161-2SUSE-SU-2018:1161-1SUSE-SU-2018:0901-1SUSE-SU-2018:0879-1

  • apache2 Alpine 3.24, Alpine 3.23, Alpine 3.22 +18 more 2.4.33-r0

alpine advisories ALPINE-CVE-2018-1283

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

  • apache Arch Linux 2.4.33-1

arch linux advisories AVG-664

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-2018-1283 updated cvss 4.8

httpd: Improper handling of headers in mod_session can allow a remote user to modify session data for CGI applications

  • Red Hat Enterprise Linux Client Optional (v. 7) httpd 2.4.6-95.el7, mod_ssl 2.4.6-95.el7, mod_ldap 2.4.6-95.el7, httpd-tools 2.4.6-95.el7, mod_session 2.4.6-95.el7, httpd-manual 2.4.6-95.el7, +1 more Red Hat Enterprise Linux ComputeNode Optional (v. 7) httpd 2.4.6-95.el7, mod_ssl 2.4.6-95.el7, mod_ldap 2.4.6-95.el7, httpd-tools 2.4.6-95.el7, mod_session 2.4.6-95.el7, httpd-manual 2.4.6-95.el7, +1 more Red Hat Enterprise Linux Server (v. 7) httpd 2.4.6-95.el7, mod_ssl 2.4.6-95.el7, httpd-tools 2.4.6-95.el7, mod_session 2.4.6-95.el7, httpd-manual 2.4.6-95.el7 Red Hat Enterprise Linux Server Optional (v. 7) mod_ldap 2.4.6-95.el7, mod_proxy_html 2.4.6-95.el7 Red Hat Enterprise Linux Workstation (v. 7) httpd 2.4.6-95.el7, mod_ssl 2.4.6-95.el7, httpd-tools 2.4.6-95.el7, mod_session 2.4.6-95.el7, httpd-manual 2.4.6-95.el7 Red Hat Enterprise Linux Workstation Optional (v. 7) mod_ldap 2.4.6-95.el7, mod_proxy_html 2.4.6-95.el7
    fixed: vendor fix RHSA-2020:3958
  • Red Hat JBoss Core Services
    fixed: vendor fix RHSA-2019:0366
  • Red Hat JBoss Core Services on RHEL 6 Server jbcs-httpd24 1-6.jbcs.el6, jbcs-httpd24-runtime 1-6.jbcs.el6, jbcs-httpd24-apr 1.6.3-31.jbcs.el6, jbcs-httpd24-httpd 2.4.29-35.jbcs.el6, jbcs-httpd24-nghttp2 1.29.0-9.jbcs.el6, jbcs-httpd24-apr-util 1.6.1-24.jbcs.el6, +22 more Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24 1-6.jbcs.el7, jbcs-httpd24-runtime 1-6.jbcs.el7, jbcs-httpd24-apr 1.6.3-31.jbcs.el7, jbcs-httpd24-httpd 2.4.29-35.jbcs.el7, jbcs-httpd24-nghttp2 1.29.0-9.jbcs.el7, jbcs-httpd24-apr-util 1.6.1-24.jbcs.el7, +22 more
    fixed: vendor fix RHSA-2019:0367
  • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6) httpd24-curl 7.61.1-1.el6, httpd24-httpd 2.4.34-7.el6, httpd24-nghttp2 1.7.1-7.el6, httpd24-libcurl 7.61.1-1.el6, httpd24-mod_ssl 2.4.34-7.el6, httpd24-mod_ldap 2.4.34-7.el6, +5 more Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) httpd24-curl 7.61.1-1.el7, httpd24-httpd 2.4.34-7.el7, httpd24-mod_md 2.4.34-7.el7, httpd24-nghttp2 1.7.1-7.el7, httpd24-libcurl 7.61.1-1.el7, httpd24-mod_ssl 2.4.34-7.el7, +6 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.4) httpd24-curl 7.61.1-1.el7, httpd24-httpd 2.4.34-7.el7, httpd24-mod_md 2.4.34-7.el7, httpd24-nghttp2 1.7.1-7.el7, httpd24-libcurl 7.61.1-1.el7, httpd24-mod_ssl 2.4.34-7.el7, +6 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.5) httpd24-curl 7.61.1-1.el7, httpd24-httpd 2.4.34-7.el7, httpd24-mod_md 2.4.34-7.el7, httpd24-nghttp2 1.7.1-7.el7, httpd24-libcurl 7.61.1-1.el7, httpd24-mod_ssl 2.4.34-7.el7, +6 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6) httpd24-curl 7.61.1-1.el7, httpd24-httpd 2.4.34-7.el7, httpd24-mod_md 2.4.34-7.el7, httpd24-nghttp2 1.7.1-7.el7, httpd24-libcurl 7.61.1-1.el7, httpd24-mod_ssl 2.4.34-7.el7, +6 more Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 6) httpd24-curl 7.61.1-1.el6, httpd24-httpd 2.4.34-7.el6, httpd24-nghttp2 1.7.1-7.el6, httpd24-libcurl 7.61.1-1.el6, httpd24-mod_ssl 2.4.34-7.el6, httpd24-mod_ldap 2.4.34-7.el6, +5 more
    +1 more products
    Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) httpd24-curl 7.61.1-1.el7, httpd24-httpd 2.4.34-7.el7, httpd24-mod_md 2.4.34-7.el7, httpd24-nghttp2 1.7.1-7.el7, httpd24-libcurl 7.61.1-1.el7, httpd24-mod_ssl 2.4.34-7.el7, +6 more
    fixed: vendor fix RHSA-2018:3558
  • Red Hat Enterprise Linux 5 httpd Red Hat Enterprise Linux 6 httpd, mod_ssl, httpd-tools, httpd-manual Red Hat Enterprise Linux 8 httpd, mod_md, mod_ssl, mod_ldap, mod_http2, httpd-tools, +4 more Red Hat JBoss Enterprise Application Platform 5 httpd Red Hat JBoss Enterprise Application Platform 6 httpd, mod_ssl, mod_ldap, httpd-tools, httpd-manual Red Hat JBoss Enterprise Web Server 2 jbcs-httpd24, jbcs-httpd24-runtime
    +2 more products
    Red Hat JBoss Web Server 3 httpd24 Red Hat Mobile Application Platform 4 rhmap-httpd-docker
    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

9.74% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 5.3 CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
NVD 2.0 3.5 AV:N/AC:M/Au:S/C:N/I:P/A:N

Affected products

  • Apache Software Foundation Apache HTTP Server

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.