Rule Document 1:66524

Rule Category

SERVER-WEBAPP -- Snort has detected traffic exploiting vulnerabilities in web based applications on servers.

Alert Message

SERVER-WEBAPP Apache MINA deserialization filter bypass remote code execution attempt

Rule Explanation

This rule looks for a Java serialization magic sequence followed by a MINA-encoded HashMap gadget with a MINA class descriptor of 0x00 in the HTTP request body. Successful exploitation enables remote code execution on the vulnerable server.

What To Look For

This rule fires on attempts to exploit a deserialization filter bypass in Apache MINA used by web applications.

Known Usage

Public information/Proof of Concept available

False Positives

No known false positives

Contributors

Cisco Talos Intelligence Group

Rule Groups

Rule Categories::Server::Web Applications

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.

Vulnerability::Severity::High

Vulnerability::Severity::Critical

CVE

CVE-2026-42779

Additional Links

github.com/advisories/GHSA-vf5j-865m-mq7c

Rule Vulnerability

Insecure Deserialization

Insecure Deserialization relates to web application security. Applications turn an object into data through serialization; the reverse of that process, deserialization, can be vulnerable to attacks when the application trusts the data that is being deserialized. Serialized data is machine readable and not encrypted; serialized user-supplied data should not be trusted. Deserialization attacks can lead to remote code execution.

CVE Additional Information

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

CVE-2026-42779

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