Port 2001 – Cisco Console (Cisco Secure Copy Protocol)

Why It’s Open

Port 2001 is used for Cisco’s asynchronous shell service, providing remote access to Cisco network devices. This service allows administrators to manage Cisco equipment through a command-line interface, similar to Telnet but with specific features for Cisco device management.

Organizations with Cisco infrastructure may have this port open for network management and configuration. While useful for administration, it’s considered a legacy service as more secure alternatives like SSH are now preferred.

Common Risks

• Clear-text Communication
  Commands and credentials transmitted unencrypted.
• Authentication Bypass
  Legacy authentication mechanisms may be vulnerable.
• Device Control
  Unauthorized access could enable network manipulation.
• Information Disclosure
  Device configuration details may be exposed.
• Privilege Escalation
  Misconfigured access controls can be exploited.

Want to save time on reporting?

Let PentestPad generate, track, and export your reports - automatically.

Book a Demo

Enumeration & Testing

Check if it’s open:

nmap -sT -p 2001

Test connection:

nc  2001

Banner grabbing:

telnet  2001

What to Look For

Mitigation

• Use SSH
  Replace async shell with SSH for device management.
• Access Controls
  Implement strict ACLs for management access.
• Authentication
  Enable strong authentication mechanisms.
• Network Segmentation
  Restrict management interfaces to secure networks.
• Monitoring
  Enable logging of all management access.

TL;DR

• Port 2001 = Cisco async shell
• Legacy management interface
• Clear-text communications
• Should use SSH instead

Known CVEs and Exploits

• CVE-2023-20198 – Authentication bypass in Cisco IOS
• CVE-2022-20649 – Command injection vulnerability
• CVE-2021-1391 – Privilege escalation in device management
• Various tools available for Cisco device testing