CVE-2006-20001: Apache HTTP Server

High severity, CVSS 7.5. EPSS: 3.5% chance of exploitation in the next 30 days.

A carefully crafted If: request header can cause a memory read, or write of a single zero byte, in a pool (heap) memory location beyond the header value sent. This could cause the process to crash. This issue affects Apache HTTP Server 2.4.54 and earlier.

Affected products

• Apache HTTP Server: before 2.4.55 (fixed in 2.4.55)

Published 2023-01-17. Last modified 2026-06-16.