CVE-2018-8011 mod_md, DoS via Coredumps on specially crafted requests

What is CVE-2018-8011?

CVE-2018-8011 is a high-severity vulnerability in Apache Http Server, published on 18 Jul 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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).

Weakness: CWE-476

Which versions are affected by CVE-2018-8011?

It affects 2 products.

Products include Apache Http Server, Netapp Cloud Backup.

How do I fix CVE-2018-8011?

Upgrade to a fixed version.

Is CVE-2018-8011 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2018-8011 exists.

Public exploit code: 1 Nuclei template.

Other vulnerabilities in Apache Http Server

• CVE-2021-42013 Apache HTTP Server Path Traversal Exploited Critical 9.8
• CVE-2024-38475 Apache HTTP Server Improper Escaping of Output Exploited Critical 9.1
• CVE-2021-40438 Apache HTTP Server-Side Request Forgery (SSRF) Exploited Critical 9.0
• CVE-2019-0211 Apache HTTP Server Privilege Escalation Exploited High 7.8
• CVE-2021-41773 Apache HTTP Server Path Traversal Exploited High 7.5

All Apache Http Server vulnerabilities

Sources

• CVE record
• NVD
• OSV
• How this page is made

Also known as ALPINE-CVE-2018-8011, CLEANSTART-2026-GS47054, DEBIAN-CVE-2018-8011.