Service:
ncsa-telnet
Protocol:
TCPPort:
9510Used for:
NCSA Telnet serviceWhy It’s Open
Port 9510 is commonly used by NCSA Telnet services, FirstClass collaborative software, and various legacy remote access applications. This port was historically used by educational institutions running NCSA (National Center for Supercomputing Applications) software and is still found in some legacy environments and specialized applications.
Common Risks
- Unencrypted telnet communications
All data including credentials transmitted in plaintext - Legacy authentication vulnerabilities
Older authentication mechanisms may be easily bypassed - FirstClass system exploitation
Collaborative software may have known security flaws - Remote shell access
Successful authentication provides command-line access - Educational data exposure
Academic systems may contain sensitive student and research data - Privilege escalation
Legacy systems may have poor access controls - Network reconnaissance
Access may reveal internal network structure and services
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Enumeration & Testing
Service Detection:
nmap -sV -p 9510Banner Grabbing:
nc 9510Vulnerability Scanning:
nmap --script vuln -p9510What to Look For
| Checkpoint | What it means |
|---|---|
| Service type identification | Determine if NCSA Telnet, FirstClass, or other legacy service |
| Authentication mechanisms | Check for weak credentials common in educational environments |
| Encryption status | Verify if communications are encrypted (rare in legacy telnet) |
| Legacy vulnerabilities | Test for known NCSA and FirstClass exploits |
| Educational data exposure | Look for student records and academic information leakage |
Mitigation
- Disable legacy telnet services
Replace with SSH or other secure alternatives - Implement network segmentation
Isolate legacy systems from public networks - Upgrade collaborative software
Migrate from FirstClass to modern solutions - Strong authentication controls
Implement multi-factor authentication where possible - Monitor legacy access
Log all connections and authentication attempts - Educational data protection
Implement FERPA compliance controls for student data - Regular security assessments
Conduct frequent vulnerability scans of legacy systems
TL;DR
- Port 9510 = NCSA Telnet/FirstClass legacy services
- Protocol: TCP
- Used for: Legacy educational communication and telnet services
- Security focus: Legacy vulnerabilities and data exposure risks
Known CVEs and Exploits
- CVE-2005-0468 - FirstClass Internet Services buffer overflow vulnerability allowing remote code execution.
- CVE-1999-0621 - NCSA Telnet service vulnerability exposing cleartext credentials.
- CVE-1999-0504 - Default password vulnerability common in legacy educational software.