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Public proof of conceptFix available

CVE-2018-8011

A public proof of concept exists; no exploitation attested.

  • Published2018-07-18
  • WeaknessCWE-476

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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).

Timeline

dates in UTC
  1. 2018-07-1814:29CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2018-8011?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2018-8011?format=csv
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Versions per branch

NVD
Apache HTTP Server
BranchAffectedFixed in
2.4= 2.4.33no fix published
Netapp cloud backup
BranchAffectedFixed in
—all versionsno fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • apache2SUSE:Linux Enterprise Module for Server Applications 15all versions · fixed in 2.4.33-3.3.1
  • apache2Debian:14all versions · fixed in 2.4.34-1
  • apache2Debian:13all versions · fixed in 2.4.34-1
  • apache2Debian:12all versions · fixed in 2.4.34-1
  • apache2CleanStartall versions · fixed in 2.4.34-r0
  • apache2Alpine:v3.24all versions · fixed in 2.4.34-r0
  • apache2Alpine:v3.23all versions · fixed in 2.4.34-r0
  • apache2Alpine:v3.22all versions · fixed in 2.4.34-r0

17 more package ranges on OSV.dev

Vendor advisories

  • CVE-2018-8011 Red Hat Product Security

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

Full record on NVD

Fix

Advisories and patches

Detection

read 2026-11-03 22:42 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVSS 3.07.5read 2026-10-23
  • NVDCVSS 2.05read 2026-10-23
  • NVDweakness (CWE)CWE-476read 2026-10-23
  • FIRST EPSSEPSS score55.6 %read 2026-11-03
  • ProjectDiscoverydetectionread 2026-11-03
  • OSVaffected packages—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2018-07-18
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2018-8011?

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).

Is CVE-2018-8011 actively exploited?

Active exploitation of CVE-2018-8011 has not been confirmed. Its EPSS score was 55.6% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-8011?

CVE-2018-8011 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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