mod_md, DoS via Coredumps on specially crafted requests

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).

Timeline

1. Jul 18, 2018, 2:00 PM UTCCVE published
2. Sep 16, 2024, 10:30 PM UTCRecord last updated
3. Oct 28, 2026EPSS reached 10%

   FIRST estimates at least a 10% chance of exploitation in the next 30 days

Affected versions

• Apache Software Foundation Apache HTTP Server

  Fixed in Apache HTTP Server 2.4.34 (Affected 2.4.33)

References 16