CVE-2026-27476 in RustFly
Summary
by MITRE • 02/19/2026
RustFly 2.0.0 contains a 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 hex-encoded payloads containing system commands to execute arbitrary operations on the target system, including reverse shell establishment and command execution.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 02/19/2026
The vulnerability identified as CVE-2026-27476 represents a critical command injection flaw within the RustFly 2.0.0 remote management system that operates through a UDP-based interface. This remote UI control mechanism exposes UDP port 5005 as its primary communication channel, accepting hex-encoded instructions from remote clients without implementing adequate input validation or sanitization measures. The design flaw allows attackers to bypass normal authentication and authorization controls by directly injecting malicious commands into the system through this exposed interface.
The technical implementation of this vulnerability stems from insufficient sanitization of input data received over the UDP port 5005 channel. When the system processes hex-encoded payloads, it fails to validate or sanitize the content before executing any operations, creating a direct path for command injection attacks. This weakness aligns with CWE-77 which specifically addresses command injection vulnerabilities where untrusted data is incorporated into system commands without proper validation. The flaw exists at the protocol level where the system assumes all incoming data is legitimate and executable, without implementing proper data filtering or command parsing mechanisms.
The operational impact of this vulnerability is severe and multifaceted, providing attackers with extensive control over compromised systems. Successful exploitation enables arbitrary command execution, allowing threat actors to establish reverse shells, escalate privileges, and perform comprehensive system reconnaissance. The vulnerability can be leveraged for lateral movement within networks, data exfiltration, and persistence establishment. From an ATT&CK framework perspective, this vulnerability maps to multiple techniques including T1059.001 for command and scripting interpreter and T1071.004 for application layer protocol. The UDP-based communication channel also provides attackers with potential stealth advantages, as UDP traffic is often less monitored than TCP traffic in network security systems.
Mitigation strategies for this vulnerability should prioritize immediate network segmentation and access control implementation. Organizations must restrict access to UDP port 5005 through firewall rules, limiting connections to trusted IP addresses only. The most effective remediation involves implementing comprehensive input validation and sanitization mechanisms that parse and validate all hex-encoded payloads before execution. System administrators should also consider disabling the remote UI control functionality if not essential, or implementing strong authentication mechanisms. Regular security audits and penetration testing should be conducted to identify similar vulnerabilities in other network services, particularly those that accept binary or hex-encoded inputs without proper sanitization. Additionally, network monitoring should be enhanced to detect anomalous UDP traffic patterns that might indicate exploitation attempts.