CVE-2006-20001 Apache HTTP Server: mod_dav out of bounds read, or write of zero byte

What is CVE-2006-20001?

CVE-2006-20001 is a high-severity memory corruption vulnerability in Apache Http Server, published on 17 Jan 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-787

Which versions are affected by CVE-2006-20001?

It affects 1 product.

Products include Apache Http Server.

How do I fix CVE-2006-20001?

Upgrade to a fixed version.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2006-20001 being exploited?

There is no known exploitation of CVE-2006-20001 in the wild and no public exploit code.

Public exploit code: 1 proofs of concept on GitHub.

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
• GitHub advisory
• How this page is made

Also known as ALPINE-CVE-2006-20001, CLSA-2023-1678136537, CLSA-2023-1678136793, CLSA-2026-1785417481, DEBIAN-CVE-2006-20001, GHSA-p5j8-2qpf-wxr5 and 1 more.