Internet-Security.com TCP port 8111 details

JetBrains TeamCity Server uses TCP port 8111 by default for its web UI and REST API (e.g., accessing http://your-teamcity-host:8111), and TeamCity build agents connect back to the server on this port.
Real-world deployments of self-hosted CI/CD servers often expose 8111 externally or behind reverse proxies for developer access.
Many internet scans (e.g., Shodan/Censys) fingerprint TeamCity by detecting HTTP banners on port 8111.
Associated with hacking/exploitation:
Port 8111 is frequently targeted because of TeamCity vulnerabilities (e.g., CVE-2023-42793 and CVE-2024-27198/27199) that enabled authentication bypass and remote code execution, leading attackers to scan for exposed TeamCity instances on 8111.

TCP 8111