# CVE-2024-11950: XnSoft XnView Classic RWZ File Parsing Integer Underflow Remote Code Execution Vulnerability

> Remote attackers can execute arbitrary code by tricking users into opening a malicious RWZ file in XnView Classic due to an integer underflow.

- **Severity:** High 7.8 (`CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 11 Dec 2024
- **Updated:** 12 Dec 2024
- **Also known as:** GHSA-x37p-5rxc-rc3h

## What is CVE-2024-11950?

CVE-2024-11950 is a high-severity vulnerability in Xnview Xnview, published on 11 Dec 2024. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

XnSoft XnView Classic RWZ File Parsing Integer Underflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of XnSoft XnView Classic. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the parsing of RWZ files. The issue results from the lack of proper validation of user-supplied data, which can result in an integer underflow before writing to memory. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-22913.

Weakness: CWE-191 (Integer Underflow (Wrap or Wraparound))

## Which versions are affected by CVE-2024-11950?

It affects 1 product.


Products: Xnview Xnview.

## How do I fix CVE-2024-11950?

No fix has been published for CVE-2024-11950 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-11950 being exploited?

There is no known exploitation of CVE-2024-11950 in the wild and no public exploit code.

## Other vulnerabilities in Xnview Xnview

- [CVE-2013-3492](https://insights.sbomify.com/CVE-2013-3492/): Memory corruption in XnView (critical 9.8)
- [CVE-2013-3493](https://insights.sbomify.com/CVE-2013-3493/): Integer overflow in XnView (critical 9.8)
- [CVE-2013-3941](https://insights.sbomify.com/CVE-2013-3941/): Memory corruption in XnView (critical 9.8)
- [CVE-2012-4988](https://insights.sbomify.com/CVE-2012-4988/): Memory corruption in n/a (critical 9.3)
- [CVE-2013-3938](https://insights.sbomify.com/CVE-2013-3938/): Integer overflow in n/a (critical 9.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-11950 and fix it if it is affected.

What it is: CVE-2024-11950 is a high-severity vulnerability in Xnview Xnview, published on 11 Dec 2024. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2024-11950 in the wild and no public exploit code.

Affected product: Xnview Xnview. 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-2024-11950/ (Markdown: https://insights.sbomify.com/CVE-2024-11950/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-11950
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-11950
- OSV: https://osv.dev/vulnerability/CVE-2024-11950

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From sbomify Insights: https://insights.sbomify.com/CVE-2024-11950/
Summaries are generated and may contain mistakes; the official description above is the record.