# CVE-2003-0795: Null dereference in n/a

> Remote attackers can crash Quagga or Zebra routing software by sending malformed telnet commands to the CLI port, causing a denial of service.

- **Severity:** Medium 5.0 (`AV:N/AC:L/Au:N/C:N/I:N/A:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 Nov 2003
- **Updated:** 8 Aug 2024
- **Also known as:** GHSA-77hp-5q78-94cv

## What is CVE-2003-0795?

CVE-2003-0795 is a medium-severity vulnerability in Sgi Propack, published on 18 Nov 2003. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The vty layer in Quagga before 0.96.4, and Zebra 0.93b and earlier, does not verify that sub-negotiation is taking place when processing the SE marker, which allows remote attackers to cause a denial of service (crash) via a malformed telnet command to the telnet CLI port, which may trigger a null dereference.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2003-0795?

It affects 3 products.


Products: Gnu Zebra, Quagga Quagga, Sgi Propack.

## How do I fix CVE-2003-0795?

No fix has been published for CVE-2003-0795 yet. Limit exposure of the affected software until one is available.

## Is CVE-2003-0795 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2003-0795 exists.

Public exploit code:

- GNU Zebra 0.9x / Quagga 0.96 - Remote Denial of Service (exploitdb)

## Other vulnerabilities in Sgi Propack

- [CVE-2003-0858](https://insights.sbomify.com/CVE-2003-0858/): Denial of service in n/a (low 2.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2003-0795 and fix it if it is affected.

What it is: CVE-2003-0795 is a medium-severity vulnerability in Sgi Propack, published on 18 Nov 2003. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2003-0795 exists.

Affected product: Sgi Propack. 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-2003-0795/ (Markdown: https://insights.sbomify.com/CVE-2003-0795/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2003-0795
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2003-0795
- OSV: https://osv.dev/vulnerability/CVE-2003-0795

---
From sbomify Insights: https://insights.sbomify.com/CVE-2003-0795/
Summaries are generated and may contain mistakes; the official description above is the record.