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Fencer Vulns
high 7.5

CVE-2018-17199 in the critical feed json

In Apache HTTP Server 2.4 release 2.4.37 and prior, mod_session checks the session expiry time before decoding the session.

published 2019-01-30 7 y ago modified 2026-06-17 4 mo ago also EUVD-2018-8963

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
20.0%
EPSS 20.0% chance of exploitation in 30 days, percentile 97%
public exploits
0
none known

Summary

In Apache HTTP Server 2.4 release 2.4.37 and prior, mod_session checks the session expiry time before decoding the session. This causes session expiry time to be ignored for mod_session_cookie sessions since the expiry time is loaded when the session is decoded.

Patch / fix

  • apache2 Debian 14, Debian 13, Debian 12 2.4.38-1

debian advisories DEBIAN-CVE-2018-17199

  • apache2 Ubuntu 14.04 LTS 2.4.7-1ubuntu4.22
  • apache2 Ubuntu 16.04 LTS 2.4.18-2ubuntu3.10
  • apache2 Ubuntu 18.04 LTS 2.4.29-1ubuntu4.6

ubuntu advisories UBUNTU-CVE-2018-17199

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-httpd RHEL 3 SOFTWARE_COLLECTIONS 2.4.34-15.el6
  • httpd24-httpd RHEL 3 SOFTWARE_COLLECTIONS 2.4.34-15.el7
  • httpd24 RHEL 3 SOFTWARE_COLLECTIONS 1.1-19.el6
  • httpd24 RHEL 3 SOFTWARE_COLLECTIONS 1.1-19.el7
  • httpd24-build RHEL 3 SOFTWARE_COLLECTIONS 1.1-19.el6
  • httpd24-mod_md RHEL 3 SOFTWARE_COLLECTIONS 2.4.34-15.el7
  • httpd24-mod_ssl RHEL 3 SOFTWARE_COLLECTIONS 1:2.4.34-15.el6
  • httpd24-mod_ssl RHEL 3 SOFTWARE_COLLECTIONS 1:2.4.34-15.el7

red hat advisories RHSA-2019:4126RHSA-2019:3932RHSA-2019:3933RHSA-2021:1809RHSA-2020:1121

  • apache2 SLE Module for Server Applications 15 2.4.33-3.9.7
  • apache2 SLES for SAP 12 SP4, SLES for SAP 12 SP3, SLES 12 SP4 +3 more 2.4.23-29.34.4
  • apache2 SLES for SAP 12 SP1, SLES 12 SP1-LTSS 2.4.16-20.24.1
  • apache2 SLES 12-LTSS 2.4.10-14.36.1

suse advisories SUSE-SU-2019:0888-2SUSE-SU-2019:0889-1SUSE-SU-2019:0888-1SUSE-SU-2019:0504-1SUSE-SU-2019:0498-1

  • apache2 openSUSE Leap 15.0 2.4.33-lp150.2.9.1

opensuse advisories openSUSE-SU-2019:0296-1

  • mod_md AlmaLinux 8 1:2.0.8-8.module_el8.5.0+2609+b30d9eec
  • mod_md AlmaLinux 8 1:2.0.8-8.module_el8.6.0+2872+fe0ff7aa
  • mod_http2 AlmaLinux 8 1.15.7-3.module_el8.5.0+2609+b30d9eec

almalinux advisories ALSA-2021:1809

  • httpd Rocky Linux 8 2.4.37-39.module+el8.4.0+571+fd70afb1
  • mod_md Rocky Linux 8 1:2.0.8-8.module+el8.5.0+695+1fa8055e
  • mod_md Rocky Linux 8 1:2.0.8-8.module+el8.4.0+553+7a69454b
  • mod_http2 Rocky Linux 8 1.15.7-3.module+el8.4.0+553+7a69454b
  • mod_http2 Rocky Linux 8 1.15.7-3.module+el8.5.0+695+1fa8055e

rocky linux advisories RLSA-2021:1809

  • apache2 Alpine 3.24, Alpine 3.23, Alpine 3.22 +16 more 2.4.38-r0

alpine advisories ALPINE-CVE-2018-17199

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 2.4.38-1

arch linux advisories AVG-857

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-2018-17199 updated cvss 5.4

httpd: mod_session_cookie does not respect expiry time

  • Red Hat Enterprise Linux AppStream (v. 8) mod_md 2.0.8-8.module+el8.3.0+6814+67d1e611, httpd 2.4.37-39.module+el8.4.0+9658+b87b2deb, mod_ssl 2.4.37-39.module+el8.4.0+9658+b87b2deb, mod_http2 1.15.7-3.module+el8.4.0+8625+d397f3da, mod_ldap 2.4.37-39.module+el8.4.0+9658+b87b2deb, httpd-tools 2.4.37-39.module+el8.4.0+9658+b87b2deb, +4 more
    fixed: vendor fix RHSA-2021:1809
  • Red Hat Enterprise Linux Client Optional (v. 7) httpd 2.4.6-93.el7, mod_ssl 2.4.6-93.el7, mod_ldap 2.4.6-93.el7, httpd-tools 2.4.6-93.el7, mod_session 2.4.6-93.el7, httpd-manual 2.4.6-93.el7, +1 more Red Hat Enterprise Linux ComputeNode Optional (v. 7) httpd 2.4.6-93.el7, mod_ssl 2.4.6-93.el7, mod_ldap 2.4.6-93.el7, httpd-tools 2.4.6-93.el7, mod_session 2.4.6-93.el7, httpd-manual 2.4.6-93.el7, +1 more Red Hat Enterprise Linux Server (v. 7) httpd 2.4.6-93.el7, mod_ssl 2.4.6-93.el7, httpd-tools 2.4.6-93.el7, mod_session 2.4.6-93.el7, httpd-manual 2.4.6-93.el7 Red Hat Enterprise Linux Server Optional (v. 7) mod_ldap 2.4.6-93.el7, mod_proxy_html 2.4.6-93.el7 Red Hat Enterprise Linux Workstation (v. 7) httpd 2.4.6-93.el7, mod_ssl 2.4.6-93.el7, httpd-tools 2.4.6-93.el7, mod_session 2.4.6-93.el7, httpd-manual 2.4.6-93.el7 Red Hat Enterprise Linux Workstation Optional (v. 7) mod_ldap 2.4.6-93.el7, mod_proxy_html 2.4.6-93.el7
    fixed: vendor fix RHSA-2020:1121
  • Red Hat JBoss Core Services
    fixed: vendor fix RHSA-2019:3935
  • Red Hat JBoss Core Services on RHEL 6 Server jbcs-httpd24-apr 1.6.3-63.jbcs.el6, jbcs-httpd24-brotli 1.0.6-7.jbcs.el6, jbcs-httpd24-curl 7.64.1-14.jbcs.el6, jbcs-httpd24-httpd 2.4.37-33.jbcs.el6, jbcs-httpd24-jansson 2.11-20.jbcs.el6, jbcs-httpd24-mod_md 2.4.37-33.jbcs.el6, +25 more
    fixed: vendor fix RHSA-2019:3932
  • Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-apr 1.6.3-63.jbcs.el7, jbcs-httpd24-brotli 1.0.6-7.jbcs.el7, jbcs-httpd24-curl 7.64.1-14.jbcs.el7, jbcs-httpd24-httpd 2.4.37-33.jbcs.el7, jbcs-httpd24-jansson 2.11-20.jbcs.el7, jbcs-httpd24-mod_md 2.4.37-33.jbcs.el7, +25 more
    fixed: vendor fix RHSA-2019:3933
  • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6) httpd24 1.1-19.el6, httpd24-build 1.1-19.el6, httpd24-runtime 1.1-19.el6, httpd24-httpd 2.4.34-15.el6, httpd24-nghttp2 1.7.1-8.el6, httpd24-scldevel 1.1-19.el6, +7 more Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) httpd24 1.1-19.el7, httpd24-runtime 1.1-19.el7, httpd24-httpd 2.4.34-15.el7, httpd24-nghttp2 1.7.1-8.el7, httpd24-scldevel 1.1-19.el7, httpd24-mod_md 2.4.34-15.el7, +7 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.5) httpd24 1.1-19.el7, httpd24-runtime 1.1-19.el7, httpd24-httpd 2.4.34-15.el7, httpd24-nghttp2 1.7.1-8.el7, httpd24-scldevel 1.1-19.el7, httpd24-mod_md 2.4.34-15.el7, +7 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6) httpd24 1.1-19.el7, httpd24-runtime 1.1-19.el7, httpd24-httpd 2.4.34-15.el7, httpd24-nghttp2 1.7.1-8.el7, httpd24-scldevel 1.1-19.el7, httpd24-mod_md 2.4.34-15.el7, +7 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7) httpd24 1.1-19.el7, httpd24-runtime 1.1-19.el7, httpd24-httpd 2.4.34-15.el7, httpd24-nghttp2 1.7.1-8.el7, httpd24-scldevel 1.1-19.el7, httpd24-mod_md 2.4.34-15.el7, +7 more Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 6) httpd24 1.1-19.el6, httpd24-build 1.1-19.el6, httpd24-runtime 1.1-19.el6, httpd24-httpd 2.4.34-15.el6, httpd24-nghttp2 1.7.1-8.el6, httpd24-scldevel 1.1-19.el6, +7 more
    +1 more products
    Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) httpd24 1.1-19.el7, httpd24-runtime 1.1-19.el7, httpd24-httpd 2.4.34-15.el7, httpd24-nghttp2 1.7.1-8.el7, httpd24-scldevel 1.1-19.el7, httpd24-mod_md 2.4.34-15.el7, +7 more
    fixed: vendor fix RHSA-2019:4126
  • Red Hat CloudForms Management Engine 5 httpd Red Hat Enterprise Linux 5 httpd Red Hat Enterprise Linux 6 httpd, mod_ssl, httpd-tools, httpd-manual 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
    +1 more products
    Red Hat JBoss Web Server 3 httpd24
    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

19.99% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:P/A:N

Affected products

  • Apache Software Foundation Apache HTTP Server

Classification

Weakness
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.