# CVE-2005-0509: Cross-site scripting in n/a

> Remote attackers can inject arbitrary HTML or scripts into Mono ASP.NET applications via Unicode encoding, potentially executing code in victim browsers.

- **Severity:** Medium 4.3 (`AV:N/AC:M/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:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 22 Feb 2005
- **Updated:** 7 Aug 2024
- **Also known as:** DEBIAN-CVE-2005-0509, GHSA-rrw3-hp87-685q

## What is CVE-2005-0509?

CVE-2005-0509 is a medium-severity cross-site scripting vulnerability in Microsoft .Net Framework, published on 22 Feb 2005. 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

Multiple cross-site scripting (XSS) vulnerabilities in the Mono 1.0.5 implementation of ASP.NET (.Net) allow remote attackers to inject arbitrary HTML or web script via Unicode representations for ASCII fullwidth characters that are converted to normal ASCII characters, including ">" and "<".

## Which versions are affected by CVE-2005-0509?

It affects 2 products.


Products: Microsoft .Net Framework, Mono Mono.

## How do I fix CVE-2005-0509?

Upgrade to a fixed version.

## Is CVE-2005-0509 being exploited?

There is no known exploitation of CVE-2005-0509 in the wild and no public exploit code.

## Other vulnerabilities in Microsoft .Net Framework

- [CVE-2020-0646](https://insights.sbomify.com/CVE-2020-0646/): Microsoft .NET Framework Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2017-8759](https://insights.sbomify.com/CVE-2017-8759/): Microsoft .NET Framework Remote Code Execution (high 7.8, exploited in the wild)
- [CVE-2015-1671](https://insights.sbomify.com/CVE-2015-1671/): Microsoft Windows Remote Code Execution (high 7.8, exploited in the wild)
- [CVE-2024-29059](https://insights.sbomify.com/CVE-2024-29059/): Microsoft .NET Framework Information Disclosure (high 7.5, exploited in the wild)
- [CVE-2014-4073](https://insights.sbomify.com/CVE-2014-4073/): Privilege escalation in n/a (critical 10.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2005-0509 and fix it if it is affected.

What it is: CVE-2005-0509 is a medium-severity cross-site scripting vulnerability in Microsoft .Net Framework, published on 22 Feb 2005. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2005-0509 in the wild and no public exploit code.

Affected product: Microsoft .Net Framework. 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-2005-0509/ (Markdown: https://insights.sbomify.com/CVE-2005-0509/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2005-0509
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2005-0509
- OSV: https://osv.dev/vulnerability/CVE-2005-0509

---
From sbomify Insights: https://insights.sbomify.com/CVE-2005-0509/
Summaries are generated and may contain mistakes; the official description above is the record.