# cups\_browsed\_internal\_external **Explanation** This event is triggered by Netography's Fusion Portal when it detects traffic on UDP port 631 exiting your network. UDP port 631 is usually associated with the CUPS-Browsed service and is used to automatically add available local printers. While it may be odd by itself, this traffic may also indicate a compromise and that an attacker is attempting to trigger CVE-2024-47176 on other hosts from your network. **What to Look For** Investigate the source of these requests for malware infection or unauthorized software, and consider blocking UDP port 631 at the firewall. **Related MITRE ATT\&CK Categories** [Initial Access, Persistence: External Remote Services, Technique T1133 - Enterprise](https://attack.mitre.org/techniques/T1133) [Initial Access: Exploit Public-Facing Application, Technique T1190 - Enterprise](https://attack.mitre.org/techniques/T1190) --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.fusion.vectra.ai/detection-models/library/post-compromise/cups_browsed_internal_external.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.