CVE-2003-0542

What it is

Multiple stack-based buffer overflows in (1) mod_alias and (2) mod_rewrite for Apache before 1.3.29 allow attackers to create configuration files to cause a denial of service (crash) or execute arbitrary code via a regular expression with more than 9 captures.

At a glance

Exploitability

Can be exploited locally on the machine without logging in. High risk of data exposure, data tampering, service disruption.

Exploit odds

30.4% chance of exploitation in the next 30 days (EPSS). Higher than most.

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2003-11-03 05:00 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-16 22:02 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 30.4% in the next 30 days (EPSS).
• Severity: 7.2 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2003-11-03 05:00 UTC

Last modified

2026-06-16 22:02 UTC

Exploit probability

30.4% · EPSS, next 30 days

Weakness

CWE-119 · Buffer errors

Record status

Modified

Affected

• Apache Http Server 1.3
• Apache Http Server 1.3.1
• Apache Http Server 1.3.3
• Apache Http Server 1.3.4
• Apache Http Server 1.3.6
• Apache Http Server 1.3.9
• Apache Http Server 1.3.11
• Apache Http Server 1.3.12

Attack profile CVSS 2.0 · 7.2

Attack vector

Local

Complexity

Low

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2003-0542.md and follow it. Check whether this project is affected by CVE-2003-0542. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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