This PR adds an advanced Nuclei template for CVE-2020-2509 affecting QNAP QTS and QuTS systems.

✅ Features:

• Multi-payload command injection (RCE)
• WAF bypass tricks
• Extractor for uid/gid in response
• Supports pitchfork attack mode
• Shodan-query tag and verified:true metadata

References:

• https://github.com/jbaines-r7/overkill
• https://vulncheck.com/xdb/533b5e83b1eb

/claim #12355