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Fencer Vulns
high 7.5

CVE-2018-1303 in the critical feed json

A specially crafted HTTP request header could have crashed the Apache HTTP Server prior to version 2.4.30 due to an out of bound read while…

published 2018-03-26 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-11911

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
69.8%
EPSS 69.8% chance of exploitation in 30 days, percentile 99.3%
public exploits
0
none known

Summary

A specially crafted HTTP request header could have crashed the Apache HTTP Server prior to version 2.4.30 due to an out of bound read while preparing data to be cached in shared memory. It could be used as a Denial of Service attack against users of mod_cache_socache. The vulnerability is considered as low risk since mod_cache_socache is not widely used, mod_cache_disk is not concerned by this vulnerability.

Patch / fix

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

debian advisories DEBIAN-CVE-2018-1303

  • 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-2018-1303

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-2018-1303

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-2018-1303 updated cvss 5.3

httpd: Out of bounds read in mod_cache_socache can allow a remote attacker to cause DoS

  • Red Hat Enterprise Linux 6 httpd, mod_ssl, httpd-tools, httpd-manual
    affected: no fix planned “Will not fix”
  • 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 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 Red Hat JBoss Web Server 3 httpd24
    +1 more products
    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

69.80% chance of exploitation in the next 30 days, higher than 99.3% 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:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

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.