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).
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apache Software Foundation | Apache HTTP Server | Fixed in Apache HTTP Server 2.4.34 (Affected 2.4.33) | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | apache2 | 2.4.34-1 | — |
| Debian 13 | apache2 | 2.4.34-1 | — |
| Debian 12 | apache2 | 2.4.34-1 | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 | apache2 | 2.4.33-3.3.1 | SUSE-SU-2018:2424-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | apache2 | 2.4.34-r0 | — |
| Alpine v3.23 | apache2 | 2.4.34-r0 | — |
| Alpine v3.22 | apache2 | 2.4.34-r0 | — |
| Alpine v3.21 | apache2 | 2.4.34-r0 | — |
| Alpine v3.20 | apache2 | 2.4.34-r0 | — |
Show 15 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | apache2 | 2.4.34-r0 | — |
| Alpine v3.18 | apache2 | 2.4.34-r0 | — |
| Alpine v3.17 | apache2 | 2.4.34-r0 | — |
| Alpine v3.16 | apache2 | 2.4.34-r0 | — |
| Alpine v3.15 | apache2 | 2.4.34-r0 | — |
| Alpine v3.14 | apache2 | 2.4.34-r0 | — |
| Alpine v3.13 | apache2 | 2.4.34-r0 | — |
| Alpine v3.12 | apache2 | 2.4.34-r0 | — |
| Alpine v3.11 | apache2 | 2.4.34-r0 | — |
| Alpine v3.10 | apache2 | 2.4.34-r0 | — |
| Alpine v3.9 | apache2 | 2.4.34-r0 | — |
| Alpine v3.8 | apache2 | 2.4.34-r0 | — |
| Alpine v3.7 | apache2 | 2.4.34-r0 | — |
| Alpine v3.6 | apache2 | 2.4.34-r0 | — |
| Alpine v3.5 | apache2 | 2.4.34-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | httpd +7 | 2.4.34-1.amzn2.1.0 | ALAS2-2018-1062 |
| Amazon Linux 2 | mod_ssl +1 | 1:2.4.34-1.amzn2.1.0 | ALAS2-2018-1062 |
Automated scanner template
A ready-made Nuclei template detects this vulnerability automatically. Vulnerabilities with public scanner templates are typically probed across the internet soon after the template appears — exposed systems should be patched first.
- Apache HTTP Server - NULL Pointer Dereference javascript/cves/2018/CVE-2018-8011.yaml
Source: projectdiscovery/nuclei-templates (MIT) — updated daily. Only links are listed.
Advisories 2
- SUSE-SU-2018:2424-1 Security update for apache2 SUSE / openSUSE Security Updates · May 2, 2025
- ALAS2-2018-1062 Moderate: httpd security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Aug 21, 2018
References
- 1041401 vdb-entry
- https://security.netapp.com/advisory/ntap-20180926-0007/
- https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2018-8011
- [httpd-cvs] 20190815 svn commit: r1048743 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilit mailing-list
- [httpd-cvs] 20190815 svn commit: r1048742 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilit mailing-list
- [httpd-cvs] 20200401 svn commit: r1058586 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilit mailing-list
- [httpd-cvs] 20200401 svn commit: r1058587 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilit mailing-list
- [httpd-cvs] 20210330 svn commit: r1073139 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/json/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1073143 [3/3] - in /websites/staging/httpd/trunk/content: ./ security/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1073140 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/cvejsontohtml.py security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.ht mailing-list
- [httpd-cvs] 20210330 svn commit: r1073139 [12/13] - in /websites/staging/httpd/trunk/content: ./ security/json/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1888194 [12/13] - /httpd/site/trunk/content/security/json/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1073149 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/ mailing-list
- [httpd-cvs] 20210330 svn commit: r1073149 [12/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/ mailing-list
- [httpd-cvs] 20210606 svn commit: r1075470 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2020-13938.json security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabiliti mailing-list