Service:
kafka
Protocol:
TCPPort:
9093Used for:
Apache Kafka message brokerWhy It’s Open
Port 9093 is commonly used by Apache Kafka for secure SSL/TLS broker communications, Prometheus Alertmanager for monitoring alerts, and various enterprise messaging systems. Kafka uses this port for encrypted client connections and inter-broker communication in production environments requiring data protection.
Common Risks
- Message queue exploitation
Unauthorized access to Kafka topics and sensitive data streams - Data exfiltration
Attackers may consume or intercept message streams - SSL/TLS misconfigurations
Weak encryption or certificate validation bypasses - Authentication bypass
Kafka may lack proper SASL or Kerberos authentication - Producer/consumer abuse
Malicious message injection or queue flooding - Alertmanager exposure
Prometheus alerts may reveal infrastructure vulnerabilities - Topic enumeration
Attackers may discover sensitive data categories and business logic
Want to save time on reporting?
Let PentestPad generate, track, and export your reports - automatically.
Enumeration & Testing
Service Detection:
nmap -sV -p 9093Kafka SSL Testing:
sslscan :9093 openssl s_client -connect :9093 -showcertsPrometheus Alertmanager Testing:
curl https://:9093/api/v1/statusWhat to Look For
| Checkpoint | What it means |
|---|---|
| Service version | Identify software version and patch level |
| Authentication | Check for default or weak credentials |
| SSL/TLS config | Verify encryption settings if applicable |
| Access controls | Test for proper authorization mechanisms |
Mitigation
- Keep software updated
Apply latest security patches - Strong authentication
Use complex passwords and 2FA - Access restrictions
Limit service to trusted networks - Monitor activity
Log and review service usage - Disable if unused
Remove unnecessary services
TL;DR
- Port 9093 = Apache Kafka SSL/Prometheus Alertmanager with message queue security
- Protocol: TCP
- Used for: Kafka SSL connections and Prometheus alerting
- Security focus: Message queue security and SSL/TLS hardening
Known CVEs and Exploits
- CVE-2022-34917 - Apache Kafka privilege escalation vulnerability affecting inter-broker communications.
- CVE-2023-1370 - Prometheus Alertmanager SSRF vulnerability allowing internal network access.
- CVE-2021-38153 - Kafka client deserialization vulnerability enabling remote code execution.
- CVE-2021-44228 - Log4j RCE potentially affecting Kafka/Alertmanager logging systems.
- CVE-2021-45046 - Log4j additional attack vectors impacting Java-based services on this port.