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Fencer Vulns
high 7.5

CVE-2017-7668 in the critical feed json

The HTTP strict parsing changes added in Apache httpd 2.2.32 and 2.4.24 introduced a bug in token list parsing, which allows ap_find_token(…

published 2017-06-20 9 y ago modified 2026-06-17 4 mo ago also EUVD-2017-16662

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
57.5%
EPSS 57.5% chance of exploitation in 30 days, percentile 99%
public exploits
0
none known

Summary

The HTTP strict parsing changes added in Apache httpd 2.2.32 and 2.4.24 introduced a bug in token list parsing, which allows ap_find_token() to search past the end of its input string. By maliciously crafting a sequence of request headers, an attacker may be able to cause a segmentation fault, or to force ap_find_token() to return an incorrect value.

Patch / fix

  • apple mac_os_x 10.11.6, 10.12.6, 10.13.1
  • apache2 Debian 14, Debian 13, Debian 12 2.4.25-4

debian advisories DEBIAN-CVE-2017-7668

  • apache2 Ubuntu 14.04 LTS 2.4.7-1ubuntu4.16
  • apache2 Ubuntu 16.04 LTS 2.4.18-2ubuntu3.3

ubuntu advisories UBUNTU-CVE-2017-7668

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 2 SOFTWARE_COLLECTIONS 2.4.25-9.el6.1
  • httpd24-httpd RHEL 2 SOFTWARE_COLLECTIONS 2.4.25-9.el7.1
  • httpd24-mod_ssl RHEL 2 SOFTWARE_COLLECTIONS 1:2.4.25-9.el6.1
  • httpd24-mod_ssl RHEL 2 SOFTWARE_COLLECTIONS 1:2.4.25-9.el7.1
  • httpd24-mod_ldap RHEL 2 SOFTWARE_COLLECTIONS 2.4.25-9.el6.1
  • httpd24-mod_ldap RHEL 2 SOFTWARE_COLLECTIONS 2.4.25-9.el7.1
  • httpd24-httpd-tools RHEL 2 SOFTWARE_COLLECTIONS 2.4.25-9.el6.1
  • httpd24-httpd-tools RHEL 2 SOFTWARE_COLLECTIONS 2.4.25-9.el7.1

red hat advisories RHSA-2017:3194RHSA-2017:3193RHSA-2017:2483RHSA-2017:2479

  • apache2 Studio Onsite 1.3, SLES for SAP 11 SP4, SLES 11 SP4 +4 more 2.2.34-70.12.1

suse advisories SUSE-SU-2017:2907-1

  • apache2 Alpine 3.24, Alpine 3.23, Alpine 3.22 +19 more 2.4.26-r0

alpine advisories ALPINE-CVE-2017-7668

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 2.4.26-1

arch linux advisories AVG-316

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-2017-7668 updated cvss 6.5

httpd: ap_find_token() buffer overread

  • Red Hat Enterprise Linux Client Optional (v. 7) httpd 2.4.6-67.el7_4.2, mod_ssl 2.4.6-67.el7_4.2, mod_ldap 2.4.6-67.el7_4.2, httpd-tools 2.4.6-67.el7_4.2, mod_session 2.4.6-67.el7_4.2, httpd-manual 2.4.6-67.el7_4.2, +1 more Red Hat Enterprise Linux ComputeNode Optional (v. 7) httpd 2.4.6-67.el7_4.2, mod_ssl 2.4.6-67.el7_4.2, mod_ldap 2.4.6-67.el7_4.2, httpd-tools 2.4.6-67.el7_4.2, mod_session 2.4.6-67.el7_4.2, httpd-manual 2.4.6-67.el7_4.2, +1 more
    fixed: vendor fix RHSA-2017:2479
  • Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.2) httpd 2.4.6-40.el7_2.6, mod_ssl 2.4.6-40.el7_2.6, mod_ldap 2.4.6-40.el7_2.6, httpd-tools 2.4.6-40.el7_2.6, mod_session 2.4.6-40.el7_2.6, httpd-manual 2.4.6-40.el7_2.6, +1 more
    fixed: vendor fix RHSA-2017:3193
  • Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.3) httpd 2.4.6-45.el7_3.5, mod_ssl 2.4.6-45.el7_3.5, mod_ldap 2.4.6-45.el7_3.5, httpd-tools 2.4.6-45.el7_3.5, mod_session 2.4.6-45.el7_3.5, httpd-manual 2.4.6-45.el7_3.5, +1 more
    fixed: vendor fix RHSA-2017:3194
  • Red Hat Enterprise Linux Server (v. 7) httpd 2.4.6-67.el7_4.2, mod_ssl 2.4.6-67.el7_4.2, httpd-tools 2.4.6-67.el7_4.2, mod_session 2.4.6-67.el7_4.2, httpd-manual 2.4.6-67.el7_4.2
    fixed: vendor fix RHSA-2017:2479
  • Red Hat Enterprise Linux Server EUS (v. 7.2) httpd 2.4.6-40.el7_2.6, mod_ssl 2.4.6-40.el7_2.6, httpd-tools 2.4.6-40.el7_2.6, httpd-manual 2.4.6-40.el7_2.6
    fixed: vendor fix RHSA-2017:3193
  • Red Hat Enterprise Linux Server EUS (v. 7.3) httpd 2.4.6-45.el7_3.5, mod_ssl 2.4.6-45.el7_3.5, httpd-tools 2.4.6-45.el7_3.5, httpd-manual 2.4.6-45.el7_3.5
    fixed: vendor fix RHSA-2017:3194
  • Red Hat Enterprise Linux Server Optional (v. 7) mod_ldap 2.4.6-67.el7_4.2, mod_proxy_html 2.4.6-67.el7_4.2
    fixed: vendor fix RHSA-2017:2479
  • Red Hat Enterprise Linux Server Optional EUS (v. 7.2) mod_ldap 2.4.6-40.el7_2.6, mod_session 2.4.6-40.el7_2.6, mod_proxy_html 2.4.6-40.el7_2.6
    fixed: vendor fix RHSA-2017:3193
show 4 more
  • Red Hat Enterprise Linux Server Optional EUS (v. 7.3) mod_ldap 2.4.6-45.el7_3.5, mod_session 2.4.6-45.el7_3.5, mod_proxy_html 2.4.6-45.el7_3.5
    fixed: vendor fix RHSA-2017:3194
  • Red Hat Enterprise Linux Workstation (v. 7) httpd 2.4.6-67.el7_4.2, mod_ssl 2.4.6-67.el7_4.2, httpd-tools 2.4.6-67.el7_4.2, mod_session 2.4.6-67.el7_4.2, httpd-manual 2.4.6-67.el7_4.2 Red Hat Enterprise Linux Workstation Optional (v. 7) mod_ldap 2.4.6-67.el7_4.2, mod_proxy_html 2.4.6-67.el7_4.2
    fixed: vendor fix RHSA-2017:2479
  • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6) httpd24-httpd 2.4.25-9.el6.1, httpd24-mod_ssl 2.4.25-9.el6.1, httpd24-mod_ldap 2.4.25-9.el6.1, httpd24-httpd-tools 2.4.25-9.el6.1, httpd24-mod_session 2.4.25-9.el6.1, httpd24-httpd-manual 2.4.25-9.el6.1, +1 more Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) httpd24-httpd 2.4.25-9.el7.1, httpd24-mod_ssl 2.4.25-9.el7.1, httpd24-mod_ldap 2.4.25-9.el7.1, httpd24-httpd-tools 2.4.25-9.el7.1, httpd24-mod_session 2.4.25-9.el7.1, httpd24-httpd-manual 2.4.25-9.el7.1, +1 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 6.7) httpd24-httpd 2.4.25-9.el6.1, httpd24-mod_ssl 2.4.25-9.el6.1, httpd24-mod_ldap 2.4.25-9.el6.1, httpd24-httpd-tools 2.4.25-9.el6.1, httpd24-mod_session 2.4.25-9.el6.1, httpd24-httpd-manual 2.4.25-9.el6.1, +1 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.3) httpd24-httpd 2.4.25-9.el7.1, httpd24-mod_ssl 2.4.25-9.el7.1, httpd24-mod_ldap 2.4.25-9.el7.1, httpd24-httpd-tools 2.4.25-9.el7.1, httpd24-mod_session 2.4.25-9.el7.1, httpd24-httpd-manual 2.4.25-9.el7.1, +1 more Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 6) httpd24-httpd 2.4.25-9.el6.1, httpd24-mod_ssl 2.4.25-9.el6.1, httpd24-mod_ldap 2.4.25-9.el6.1, httpd24-httpd-tools 2.4.25-9.el6.1, httpd24-mod_session 2.4.25-9.el6.1, httpd24-httpd-manual 2.4.25-9.el6.1, +1 more Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) httpd24-httpd 2.4.25-9.el7.1, httpd24-mod_ssl 2.4.25-9.el7.1, httpd24-mod_ldap 2.4.25-9.el7.1, httpd24-httpd-tools 2.4.25-9.el7.1, httpd24-mod_session 2.4.25-9.el7.1, httpd24-httpd-manual 2.4.25-9.el7.1, +1 more
    fixed: vendor fix RHSA-2017:2483
  • Red Hat Enterprise Linux 5 httpd Red Hat Enterprise Linux 6 httpd, mod_ssl, httpd-tools, httpd-manual Red Hat JBoss Core Services jbcs-httpd24-httpd Red Hat JBoss Enterprise Application Platform 5 jbossas jbossas Red Hat JBoss Enterprise Application Platform 6 jbossas jbossas Red Hat JBoss Enterprise Web Server 1 httpd
    +2 more products
    Red Hat JBoss Enterprise Web Server 2 jbcs-httpd24, jbcs-httpd24-runtime Red Hat JBoss Enterprise Web Server 3 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

57.47% 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 7.5 CVSS:3.1/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.