CVE-2026-27476
📋 TL;DR
RustFly 2.0.0 contains a critical command injection vulnerability in its remote UI control mechanism that accepts hex-encoded instructions over UDP port 5005 without proper sanitization. Attackers can send crafted payloads to execute arbitrary system commands, potentially leading to complete system compromise. All systems running RustFly 2.0.0 with the remote UI control feature enabled are affected.
💻 Affected Systems
- RustFly
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover via reverse shell, data exfiltration, ransomware deployment, and lateral movement within the network.
Likely Case
Unauthenticated remote code execution leading to service disruption, data theft, and installation of backdoors or malware.
If Mitigated
Limited impact if network segmentation and strict firewall rules prevent UDP 5005 access from untrusted networks.
🎯 Exploit Status
Exploitation requires only sending crafted UDP packets to port 5005, making it trivial for attackers with network access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not provided in references
Restart Required: No
Instructions:
1. Check vendor website for security updates
2. If patch available, download and apply according to vendor instructions
3. Monitor official channels for patch release
🔧 Temporary Workarounds
Block UDP Port 5005
linuxBlock access to UDP port 5005 at network perimeter and internally using firewall rules
iptables -A INPUT -p udp --dport 5005 -j DROP
ufw deny 5005/udp
Disable Remote UI Control
allDisable the vulnerable remote UI control feature if possible
Check RustFly configuration for remote control settings and disable
🧯 If You Can't Patch
- Implement strict network segmentation to isolate RustFly systems from untrusted networks
- Deploy intrusion detection systems to monitor for UDP 5005 traffic and command injection attempts
🔍 How to Verify
Check if Vulnerable:
Check if RustFly 2.0.0 is running and listening on UDP port 5005: netstat -anup | grep 5005 or ss -ulpn | grep 5005Check Version:
Check RustFly version through application interface or configuration filesVerify Fix Applied:
Verify UDP port 5005 is no longer listening or is blocked, and check RustFly version is updated if patch becomes available📡 Detection & Monitoring
Log Indicators:
- Unusual UDP traffic on port 5005
- Suspicious system commands executed from RustFly process
- Failed authentication attempts if logging enabled
Network Indicators:
- UDP packets to port 5005 containing hex-encoded data with command injection patterns
- Outbound connections from RustFly system to unknown IPs
SIEM Query:
source_port=5005 AND protocol=UDP AND (payload_contains="|" OR payload_contains="$" OR payload_contains="`")