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Fencer Vulns
high 7.5

CVE-2018-8011 in the critical feed json

mod_md, DoS via Coredumps on specially crafted requests

published 2018-07-18 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-19719

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
55.3%
EPSS 55.3% chance of exploitation in 30 days, percentile 99%
public exploits
0
none known, plus a Nuclei check

Summary

By specially crafting HTTP requests, the mod_md challenge handler would dereference a NULL pointer and cause the child process to segfault. This could be used to DoS the server. Fixed in Apache HTTP Server 2.4.34 (Affected 2.4.33).

Patch / fix

  • apache2 Debian 14, Debian 13, Debian 12 2.4.34-1

debian advisories DEBIAN-CVE-2018-8011

  • apache2 SLE Module for Server Applications 15 2.4.33-3.3.1

suse advisories SUSE-SU-2018:2424-1

  • apache2 Alpine 3.24, Alpine 3.23, Alpine 3.22 +17 more 2.4.34-r0

alpine advisories ALPINE-CVE-2018-8011

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 2.4.34-1

arch linux advisories AVG-736

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-2018-8011 updated cvss 5.3

httpd: mod_md: NULL pointer dereference causing httpd child process crash

  • Red Hat Enterprise Linux 6 httpd, mod_ssl, httpd-tools, httpd-manual Red Hat Enterprise Linux 7 httpd, mod_ssl, mod_ldap, httpd-tools, mod_session, httpd-manual, +1 more Red Hat Enterprise Linux 8 httpd, mod_md, mod_ssl, mod_ldap, mod_http2, httpd-tools, +4 more Red Hat JBoss Core Services jbcs-httpd24-httpd Red Hat JBoss Enterprise Application Platform 5 httpd Red Hat JBoss Enterprise Application Platform 6 httpd, mod_ssl, mod_ldap, httpd-tools, httpd-manual
    +5 more products
    Red Hat JBoss Enterprise Web Server 2 jbcs-httpd24, jbcs-httpd24-runtime Red Hat JBoss Web Server 3 httpd24 Red Hat Mobile Application Platform 4 httpd Red Hat Software Collections httpd24-httpd, httpd24-mod_md, httpd24-mod_ssl, httpd24-mod_ldap, httpd24-httpd-tools, httpd24-mod_session, +2 more Red Hat Virtualization 4 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

55.33% chance of exploitation in the next 30 days, higher than 99% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • Nuclei template Apache HTTP Server - NULL Pointer Dereference nuclei detection template

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.