Rule Document 1:66671

Rule Category

SERVER-OTHER -- Snort has detected traffic exploiting vulnerabilities in a server in the network.

Alert Message

SERVER-OTHER Check Point Remote Access VPN IKEv1 authentication bypass attempt

Rule Explanation

This rule looks for a specific IKEv1 authentication sequence that includes a known magic identifier followed by a byte pattern indicating the vulnerable flag. Successful exploitation allows an unauthenticated client to gain access to the VPN service.

What To Look For

This rule fires on attempts to bypass authentication in Check Point Remote Access VPN IKEv1 servers.

Known Usage

No public information

False Positives

No known false positives

Contributors

Cisco Talos Intelligence Group

Rule Groups

MITRE::ATT&CK Framework::Enterprise::Initial Access::Exploit Public-Facing Application

Adversaries may attempt to take advantage of a weakness in an Internet-facing computer or program using software, data, or commands in order to cause unintended or unanticipated behavior. The weakness in the system can be a bug, a glitch, or a design vulnerability. These applications are often websites, but can include databases (like SQL), standard services (like SMB or SSH), network device administration and management protocols (like SNMP and Smart Install), and any other applications with Internet accessible open sockets, such as web servers and related services.

Rule Categories::Server::Other

Vulnerability::Severity::Critical

Vulnerability::Severity::High

CVE

CVE-2026-50751

Additional Links

support.checkpoint.com/results/sk/sk185033

Rule Vulnerability

Authentication Bypass

An Authentication Bypass occurs when there is a way to avoid providing user credentials to a system before performing restricted operations on said system.

CVE Additional Information

This product uses data from the NVD API but is not endorsed or certified by the NVD.

CVE-2026-50751

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