# CVE-2002-0840: Cross-site scripting in n/a

> Remote attackers can execute arbitrary scripts in victim browsers via the Host header when specific DNS and configuration settings are enabled.

- **Severity:** Medium 6.8 (`AV:N/AC:M/Au:N/C:P/I:P/A:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 1 Sep 2004
- **Updated:** 8 Aug 2024
- **Also known as:** DEBIAN-CVE-2002-0840, GHSA-rg25-cp4q-r4c8

## What is CVE-2002-0840?

CVE-2002-0840 is a medium-severity cross-site scripting vulnerability in Apache Http Server, published on 1 Sep 2004. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Cross-site scripting (XSS) vulnerability in the default error page of Apache 2.0 before 2.0.43, and 1.3.x up to 1.3.26, when UseCanonicalName is "Off" and support for wildcard DNS is present, allows remote attackers to execute script as other web page visitors via the Host: header, a different vulnerability than CAN-2002-1157.

## Which versions are affected by CVE-2002-0840?

It affects 5 products.


Products: Apache Http Server, Oracle Application Server, Oracle Database Server, Oracle Oracle8i, Oracle Oracle9i.

## How do I fix CVE-2002-0840?

Upgrade to a fixed version.

## Is CVE-2002-0840 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2002-0840 exists.

Public exploit code:

- Apache 1.3/2.0.x - Server Side Include Cross-Site Scripting (exploitdb)

## Other vulnerabilities in Apache Http Server

- [CVE-2021-42013](https://insights.sbomify.com/CVE-2021-42013/): Apache HTTP Server Path Traversal (critical 9.8, exploited in the wild)
- [CVE-2024-38475](https://insights.sbomify.com/CVE-2024-38475/): Apache HTTP Server Improper Escaping of Output (critical 9.1, exploited in the wild)
- [CVE-2021-40438](https://insights.sbomify.com/CVE-2021-40438/): Apache HTTP Server-Side Request Forgery (SSRF) (critical 9.0, exploited in the wild)
- [CVE-2019-0211](https://insights.sbomify.com/CVE-2019-0211/): Apache HTTP Server Privilege Escalation (high 7.8, exploited in the wild)
- [CVE-2021-41773](https://insights.sbomify.com/CVE-2021-41773/): Apache HTTP Server Path Traversal (high 7.5, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2002-0840 and fix it if it is affected.

What it is: CVE-2002-0840 is a medium-severity cross-site scripting vulnerability in Apache Http Server, published on 1 Sep 2004. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2002-0840 exists.

Affected product: Apache Http Server. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2002-0840/ (Markdown: https://insights.sbomify.com/CVE-2002-0840/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2002-0840
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2002-0840
- OSV: https://osv.dev/vulnerability/CVE-2002-0840

---
From sbomify Insights: https://insights.sbomify.com/CVE-2002-0840/
Summaries are generated and may contain mistakes; the official description above is the record.