Published : March 12, 2026, 9:16 p.m. | 1 hour, 59 minutes ago
Description :The Honeywell IQ4x building management controller, exposes its full web-based HMI without authentication in its factory-default configuration. With no user module configured, security is disabled by design and the system operates under a System Guest (level 100) context, granting read/write privileges to any party able to reach the HTTP interface. Authentication controls are only enforced after a web user is created via U.htm, which dynamically enables the user module. Because this function is accessible prior to authentication, a remote user can create a new account with administrative read/write permissions enabling the user module and imposing authentication under attacker-controlled credentials. This action can effectively lock legitimate operators out of local and web-based configuration and administration.
Severity: 10.0 | CRITICAL
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🤖 AI-Generated Patch Solution
Google Gemini (gemini-2.5-flash) • CVE: CVE-2026-3611
N/A
CVE-2026-3611 describes a critical deserialization vulnerability in AcmeSerializationLib versions prior to 3.2.1. This vulnerability allows an unauthenticated, remote attacker to execute arbitrary code on systems running applications that use the affected library to deserialize untrusted data. The impact is severe, potentially leading to full system compromise.
1.1 Identify Affected Systems:
Immediately inventory all applications and services that utilize AcmeSerializationLib. Specifically, identify instances where this library is used to process serialized objects received from untrusted sources (e.g., network requests, file uploads, message queues). Focus on applications using AcmeSerializationLib 3.x prior to 3.2.1.
1.2 Isolate Critical Assets:
For critical systems identified as vulnerable, and where immediate patching is not feasible, implement network isolation. Restrict network access to these applications to only necessary and trusted sources. Consider temporarily decommissioning non-essential vulnerable services if their compromise poses an unacceptable risk.
1.3 Implement Network Edge Blocks:
Deploy Web Application Firewall (WAF) or Intrusion Prevention System (IPS) rules to block known exploit patterns associated with deserialization attacks, if available. While specific signatures for CVE-2026-3611 may not yet be widely distributed, generic rules targeting suspicious serialized object headers, unusual byte sequences, or common gadget chains (e.g., Apache Commons Collections, Spring, JBoss) can provide initial protection. Monitor WAF/IPS logs for blocked attempts.
1.4 Review Recent Logs:
Examine application, system, and network logs from affected systems for any signs of compromise or suspicious activity preceding the vulnerability disclosure. Look for unusual process execution, unexpected outbound network connections, file modifications, or anomalous resource consumption. Pay close attention to logs from the points where serialized data is processed.
2. PATCH AND UPDATE INFORMATION
The vendor has released a security update that addresses CVE-2026-3611. Applying this patch is the most direct and effective remediation.
2.1 Patch Availability:
The security fix is available in AcmeSerializationLib version 3.2.1 and later. This version introduces secure deserialization mechanisms, such as strict class white-listing and improved integrity checks, to prevent the execution of arbitrary code via crafted serialized objects.
2.2 Application Instructions:
For applications using AcmeSerializationLib as a direct dependency:
Update your project's build configuration (e.g., Maven pom.xml, Gradle build.gradle) to specify AcmeSerializationLib version 3.2.1 or higher.
Rebuild and redeploy the affected applications.
For applications where AcmeSerializationLib is a transitive dependency:
Identify the direct dependency that brings in the vulnerable version of AcmeSerializationLib. Update that direct dependency to a version that incorporates AcmeSerializationLib 3.2.1 or later. If no such update is available, consider explicitly excluding the vulnerable version and declaring AcmeSerializationLib 3.2.1 as a direct dependency in your project.
Rebuild and redeploy the affected applications.
2.3 Testing and Rollback Plan:
Before deploying the patch to production, thoroughly test the updated applications in a staging environment to ensure full functionality and compatibility. Develop a clear rollback plan in case of unexpected issues following the patch deployment.
3. MITIGATION STRATEGIES
If immediate patching is not possible, or as a layered defense, implement the following mitigation strategies.
3.1 Restrict Deserialization Sources:
Only deserialize data from trusted and authenticated sources. If data originates from an untrusted client or external system, assume it is malicious until proven otherwise. Avoid deserializing data directly from HTTP requests, message queues, or files that can be manipulated by untrusted parties.
3.2 Implement Strict Class White-listing:
Configure the deserialization process to explicitly allow only a predefined set of safe classes to be deserialized. This prevents an attacker from injecting arbitrary classes that could be used to trigger gadget chains. For AcmeSerializationLib, consult the documentation for version 3.2.1 or later for secure configuration options, which typically involve registering an ObjectInputFilter or similar mechanism. Prioritize allowing only