Port 6646McAfee Agent Discovery
*McAfee Network Agent uses UDP port 6646 primarily for local network device discovery. This facilitates the detection of other endpoints running McAfee software, potentially to optimize internal communication such as update distribution or peer management.*.
- transport
- udp
- in transit
- cleartext
- assignment
- unofficial
- risk
- 4/10
- lookups
- 15,774
single transport
payload readable on path
used by convention
caution
rank 193 of 993 · top 19%
Technical Details
what runs on :6646The McAfee Network Agent operating on UDP port 6646 is part of the broader McAfee security ecosystem commonly installed on Windows-based endpoints. This service periodically broadcasts network packets to detect other McAfee-enabled devices within the local area network (LAN). The agent is designed to build a network-aware map that aids in efficient software update delivery and centralized policy management.
Specific network activity typically manifests as multicast or broadcast UDP packets sent at regular intervals. The precise protocol details remain largely proprietary and under-documented, but it appears to enable the discovery of peer endpoints or relay information to local management consoles. This can reduce the need for individual internet-based updates for each device, thereby minimizing bandwidth consumption across the external internet connection.
Implementation generally requires the Network Agent service running persistently in the background on Windows machines. Disabling the associated Windows service halts communications on this port. The setup is unofficially standardized, meaning it's an internal convention rather than being governed by a formal IANA assignment.
Security Information
exposure of :6646risk score
4/ 10caution
worth attention. how exposed you are depends on configuration — don't leave it reachable from the internet without a reason.
security averages 3.8 across 216 ports — this one sits 0.2 above.
in transit
cleartext
credentials and payloads are readable by anyone on path
assignment
unofficial
used by convention, not registered — what answers here varies by deployment
reachable over
udp
udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite
security overview
Common Vulnerabilities:
- Unauthorized access or impersonation through spoofed UDP packets, potentially misleading McAfee management functions
- Detection by malicious actors using network scanning tools, revealing active McAfee presence on endpoints
- Exploitation due to misconfigured firewalls leaving the port unnecessarily exposed beyond trusted networks
Common Mitigations:
- Restrict UDP port 6646 to internal trusted zones using host-based or perimeter firewalls
- Disable the Network Agent service if not necessary, especially on isolated endpoints
- Monitor and alert on unusual discovery traffic to prevent lateral movement by attackers
- Keep McAfee software fully updated with security patches to minimize exploitation risks through auxiliary vulnerabilities
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risk mix of the 8 listed
- caution100%
3 of 8 encrypted