Apache HTTP Server: mod_dav out of bounds read, or write of zero byte

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.

Scores

EPSS (exploitation in 30 days)

3.6% · top 11% of all CVEs (5 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.

Weakness

• CWE-787 Out-of-bounds Write (opens in a new tab)All about CWE-787 and its CVEs

Affected products

• Apache Software Foundation · Apache HTTP Server

  • affected 2.4 – ≤ 2.4.54

References (3)

• https://httpd.apache.org/security/vulnerabilities_24.html (opens in a new tab)vendor-advisoryx_transferred
• https://security.gentoo.org/glsa/202309-01 (opens in a new tab)x_transferred
• https://security.netapp.com/advisory/ntap-20230316-0005/ (opens in a new tab)

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2006-20001](https://trackcve.app/badge/CVE-2006-20001.svg)](https://trackcve.app/cve/CVE-2006-20001)

Record last updated 13 Feb 2025, 16:27 UTC.