# CVE-2001-1556: Information disclosure in n/a

> Remote attackers can spoof source IP addresses and hide HTTP requests in Apache logs by injecting control characters, misleading administrators using standard UNIX tools.

- **Severity:** Medium 5.0 (`AV:N/AC:L/Au:N/C:N/I:P/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 14 Jul 2005
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-9f54-6r7j-3hph

## What is CVE-2001-1556?

CVE-2001-1556 is a medium-severity vulnerability in Apache Http Server, published on 14 Jul 2005. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The log files in Apache web server contain information directly supplied by clients and does not filter or quote control characters, which could allow remote attackers to hide HTTP requests and spoof source IP addresses when logs are viewed with UNIX programs such as cat, tail, and grep.

Weakness: CWE-532 (Insertion of Sensitive Information into Log File)

## Which versions are affected by CVE-2001-1556?

It affects 1 product.


Products: Apache Http Server.

## How do I fix CVE-2001-1556?

No fix has been published for CVE-2001-1556 yet. Limit exposure of the affected software until one is available.

## Is CVE-2001-1556 being exploited?

There is no known exploitation of CVE-2001-1556 in the wild and no public exploit code.

## 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-2001-1556 and fix it if it is affected.

What it is: CVE-2001-1556 is a medium-severity vulnerability in Apache Http Server, published on 14 Jul 2005. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2001-1556 in the wild and no public exploit code.

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-2001-1556/ (Markdown: https://insights.sbomify.com/CVE-2001-1556/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2001-1556
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2001-1556
- OSV: https://osv.dev/vulnerability/CVE-2001-1556

---
From sbomify Insights: https://insights.sbomify.com/CVE-2001-1556/
Summaries are generated and may contain mistakes; the official description above is the record.