Every CVE Search/ Get API key

CVE-2018-8011

mod_md, DoS via Coredumps on specially crafted requests

7.5 HighFix available

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).

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

55.3%Up 46.6 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 7.5

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).

Record
CVE-2018-8011
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0
5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness
CWE-476
Updated
2026-11-02
CVE List No score

mod_md, DoS via Coredumps on specially crafted requests

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).

Record
CVE-2018-8011
Updated
2026-11-02
EUVDEUVD-2018-19719 No score

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).

Record
EUVD-2018-19719
Updated
2026-11-03
OSVALPINE-CVE-2018-8011 7.5

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).

Record
ALPINE-CVE-2018-8011
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVBELL-CVE-2018-8011 7.5

CVE-2018-8011 does not affect BellSoft software

Record
BELL-CVE-2018-8011
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSV 7.5

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).

Record
CVE-2018-8011
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2018-8011 7.5

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).

Record
DEBIAN-CVE-2018-8011
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2018-8011 7.5

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).

Record
UBUNTU-CVE-2018-8011
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVSUSE-SU-2018:2424-1 No score

Security update for apache2

This update for apache2 fixes the following issues:

The following security vulnerabilities were fixed:

  • CVE-2018-1333: Fixed a worker exhaustion that could have lead to a denial of service via specially crafted HTTP/2 requests (bsc#1101689).
  • CVE-2018-8011: Fixed a null pointer dereference in mod_md, which could have lead to a denial of service via specially crafted HTTP requests (bsc#1101688). Note: We are currently not shipping this modules, since it is still considered experimental, but we might start to ship it with future releases.
Record
SUSE-SU-2018:2424-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
apache2
Alpine:v3.10
 before 2.4.34-r0
2.4.34-r0
apache2
Alpine:v3.11
 before 2.4.34-r0
2.4.34-r0
apache2
Alpine:v3.12
 before 2.4.34-r0
2.4.34-r0
apache2
Alpine:v3.13
 before 2.4.34-r0
2.4.34-r0
apache2
Alpine:v3.14
 before 2.4.34-r0
2.4.34-r0
apache2
Alpine:v3.15
 before 2.4.34-r0
2.4.34-r0
apache2
Alpine:v3.16
 before 2.4.34-r0
2.4.34-r0
apache2
Alpine:v3.17
 before 2.4.34-r0
2.4.34-r0
apache2
Alpine:v3.18
 before 2.4.34-r0
2.4.34-r0
apache2
Alpine:v3.19
 before 2.4.34-r0
2.4.34-r0
Show 14 moreShow less
Affected packages
PackageAffectedFixed
apache2
Alpine:v3.20
 before 2.4.34-r0
2.4.34-r0
apache2
Alpine:v3.21
 before 2.4.34-r0
2.4.34-r0
apache2
Alpine:v3.22
 before 2.4.34-r0
2.4.34-r0
apache2
Alpine:v3.23
 before 2.4.34-r0
2.4.34-r0
apache2
Alpine:v3.24
 before 2.4.34-r0
2.4.34-r0
apache2
Alpine:v3.5
 before 2.4.34-r0
2.4.34-r0
apache2
Alpine:v3.6
 before 2.4.34-r0
2.4.34-r0
apache2
Alpine:v3.7
 before 2.4.34-r0
2.4.34-r0
apache2
Alpine:v3.8
 before 2.4.34-r0
2.4.34-r0
apache2
Alpine:v3.9
 before 2.4.34-r0
2.4.34-r0
apache2
Debian:12
 before 2.4.34-1
2.4.34-1
apache2
Debian:13
 before 2.4.34-1
2.4.34-1
apache2
Debian:14
 before 2.4.34-1
2.4.34-1
apache2
SUSE:Linux Enterprise Module for Server Applications 15
From an advisory covering 2 CVEs
 before 2.4.33-3.3.1
2.4.33-3.3.1

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
SourceLinkDate
NucleiApache HTTP Server - NULL Pointer Dereference

History

History
RecordedChangedSources
affected, facts
affected
aliasesEUVD
first indexedCVE List, Nuclei, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2018-8011 is a high vulnerability (CVSS 7.5) in Apache Http Server, published July 18, 2018. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 55.3%, the 99th percentile. Fixed in apache2 2.4.34-r0.

References

Show 20 moreShow less
Pages All vulnerabilities Browse Docs Sources Guide Get API key
MoveEnter Open