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VNC

VNC remote desktop protocol testing covering auth probing, version fingerprinting, brute force, session hijacking, hash decryption, and post-access lateral movement and persistence via reverse callbacks

:5900 :5901 :5902 :5903 10 guides 3 phases

1 min read Updated: Jul 14, 2026

What is VNC?

VNC (Virtual Network Computing) offers remote GUI access to desktops or servers.

Common security issues

No encryption by default.
Weak or no authentication.
Brute-force logins.
Exposed to the internet.

Default ports

5900+ (one per display)

Enumeration

VNC discovery, auth probing, version fingerprinting, default creds

View all 3

Manual VNC Connection and Default Creds

Jan 4, 2026 • 2 min read

VNC Authentication Probing

Jan 4, 2026 • 3 min read

VNC Service Discovery and Version Fingerprinting

Jan 4, 2026 • 4 min read

Exploitation

Brute force, bypass auth, hijack sessions, and decrypt VNC hashes

View all 6

VNC Brute Force and Default Credential Exploitation

Exploit VNC services via brute force and default credentials using Hydra, Metasploit, and manual techniques to gain unauthorised remote desktop access.

Mar 12, 2026 • 2 min read

CVE-2006-2369 – RealVNC Authentication Bypass

Mar 12, 2026 • 2 min read

VNC Reverse Connection – Receiving Sessions from Behind NAT

Exploit VNC reverse connections to receive sessions from NAT-restricted targets, bypassing firewall constraints during post-exploitation access.

Mar 12, 2026 • 3 min read

VNC Session Hijacking – Stealing Active Sessions

Mar 12, 2026 • 3 min read

VNC Unauthenticated Access – No-Auth Desktop Access

Mar 12, 2026 • 2 min read

VNC Password Hash Extraction and Decryption

Covers extracting stored VNC password hashes from registry/config files and decrypting them using DES-based algorithms to recover plaintext credentials during exploitation.

Mar 12, 2026 • 2 min read

Persistence

Guides on maintaining access via reverse VNC callbacks

View all 1

VNC Persistence – Graphical Re-Entry via Reverse VNC

Mar 12, 2026 • 3 min read