Port 514Syslog
Syslog operates primarily over UDP port 514 to facilitate the centralization of log messages from network devices and Unix systems. It allows administrators to collect, store, and analyze log data centrally, streamlining monitoring, troubleshooting, and security event analysis across distributed systems..
- transport
- udp
- in transit
- cleartext
- assignment
- official
- risk
- 4/10
- lookups
- 8,864
single transport
payload readable on path
registered with iana
caution
rank 561 of 993 · top 56%
1 other service is registered on port 514. compare all 2 →
Technical Details
what runs on :514Syslog is a widely adopted standard for forwarding log messages across an IP network. Mainly used within Unix-like systems, routers, switches, and security appliances, it enables these devices to transmit their software-generated logging and diagnostic information to a central server, known as the Syslog server or collector. The primary benefit is to unify logs generated from various devices into a single accessible location.
Syslog traditionally employs UDP port 514 for communication. UDP is chosen due to its low-overhead and speed, favoring rapid delivery of messages without establishing a reliable connection. However, due to the connectionless nature of UDP, message delivery is unacknowledged, and packets may be lost or received out of order, which is acceptable for many non-critical system logs. Some implementations can also support TCP or secure transport to increase reliability and security.
The protocol itself defines a simple message format containing a priority value (which encodes facility and severity), timestamp, hostname, tag, and content. Beyond the basic syslog protocol described in RFC 3164, standardized enhancements such as RFC 5424 add structured data, improve message timestamps, and support for additional transports, enhancing interoperability, extensibility, and security capabilities.
Security Information
exposure of :514risk 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
official
registered with iana for this service — scanners fingerprint it by number
reachable over
udp
udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite
security overview
Common Vulnerabilities:
- Because traditional Syslog over UDP is plaintext and connectionless, it is vulnerable to:
- Packet sniffing and interception, which exposes sensitive log data.
- Log injection, where attackers send forged messages to obscure malicious activity or mislead administrators.
- Packet loss or spoofing, leading to incomplete or manipulated audit trails.
- Attackers exploiting these weaknesses can cover their tracks, mislead forensic analysis, or launch denial of service attacks against the collector.
Common Mitigations:
- Prefer secure alternatives such as Syslog over TLS (RFC 5425), to encrypt log traffic and authenticate endpoints.
- If feasible, employ TCP-based Syslog to ensure reliable delivery.
- Filter Syslog input on servers to accept messages only from trusted network addresses.
- Use network segmentation and firewalls to limit access to Syslog ports.
- Enable integrity monitoring and alerting for anomalies in log flow.
- Regularly review and validate logging policies and incoming messages to detect tampering or irregularities.
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risk mix of the 8 listed
- caution100%
3 of 8 encrypted