Individual skill
pentesting-vnc
Testing VNC remote desktop services using the Remote Frame Buffer (RFB) protocol during authorized engagements. VNC commonly listens on 5900/5901 (and web clients on 5800/5801). Covers RFB fingerprinting, no-auth / RealVNC auth-bypass detection with nmap NSE and Metasploit, password brute force, decrypting the weak 3DES-stored ~/.vnc/passwd, and gaining graphical desktop control.
internal/tools/skills/data/network-services-pentesting/pentesting-vnc/SKILL.md
Source commit d42f381ad34843e71a42658e5c57290c713e85af
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- Matches the observed repository HEAD
- Yes
- Scanner rules are current
- Yes
- Repository scan complete
- No
- Skill scan complete
- No
- Observed behavior
- Instructions only
- Last checked
- Nov 7, 2026
These are observations at the recorded commit, not a guarantee of safety. Review the source before running it.
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Repository context
- Repository stars (not skill ratings)
- 1,309
- Repository last updated
- Nov 5, 2026
- License
- Apache-2.0
Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.
- cybersecurity Repository topic
- security Repository topic
- bug-bounty Repository topic
- automation Repository topic
- autonomous-pentesting Repository topic
- ai-agent Repository topic
- ai-security Repository topic
- ethical-hacking Repository topic
- golang Repository topic
- penetration-testing Repository topic
- penetration-testing Declared skill tag
- network-services Declared skill tag
- vnc Declared skill tag
- rfb Declared skill tag
- remote-desktop Declared skill tag
- brute-force Declared skill tag
- testing Derived category
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# Pentesting VNC (port 5900/5901)
## When to Use
- During authorized assessments when a VNC port is open (5800/5801 web, 5900/5901 RFB, or 5900+display)
- When testing for unauthenticated ("None" auth) VNC access to a desktop
- When testing for the RealVNC authentication bypass
- When you recover a `~/.vnc/passwd` file and need to decrypt the stored password
- When validating weak/default VNC passwords via brute force
## Quick Enumeration
```bash
# RFB version, auth types, and known bypasses