CVE-2019-25401 in MP-4200
Summary
by MITRE • 02/19/2026
Bematech (formerly Logic Controls, now Elgin) MP-4200 TH printer contains a denial of service vulnerability in the admin configuration page. Remote attackers can send crafted POST requests with malformed 'admin' and 'person' parameters to crash the printer's web service, causing a denial of service condition.
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Analysis
by VulDB Data Team • 02/19/2026
The CVE-2019-25401 vulnerability affects the Bematech MP-4200 TH printer, a widely used thermal receipt printer in retail and hospitality environments. This device operates with a web-based administration interface that allows remote configuration and management through HTTP requests. The vulnerability stems from inadequate input validation within the printer's web service implementation, specifically in how it processes administrative configuration parameters. The printer's firmware fails to properly sanitize or validate user-supplied data when processing POST requests to its administrative endpoints, creating a condition where malformed input can cause the system to crash and become unresponsive.
The technical flaw manifests when remote attackers exploit the lack of proper parameter validation in the printer's web interface. By crafting malicious POST requests containing malformed 'admin' and 'person' parameters, attackers can trigger a buffer overflow or memory corruption condition within the printer's web service daemon. This vulnerability is classified as a classic input validation flaw that aligns with CWE-20, which describes "Improper Input Validation" in software systems. The specific nature of the vulnerability allows for remote code execution potential and can be categorized under the broader ATT&CK technique T1499.001, which covers "Network Denial of Service" attacks targeting network infrastructure devices.
The operational impact of this vulnerability is significant for organizations relying on these printers for critical business operations. A successful exploitation can cause complete service disruption, forcing businesses to manually restart the printer or replace the device entirely. In retail environments, this can result in transaction processing delays, customer service disruptions, and potential financial losses. The vulnerability affects not only individual devices but also creates a risk for network-wide denial of service conditions if multiple printers are connected to the same network segment and accessible to attackers. Organizations using these printers in critical infrastructure settings face additional risks as the printer's web service may be accessible from external networks, making the vulnerability exploitable from outside the organization's perimeter.
Mitigation strategies for CVE-2019-25401 should focus on both immediate and long-term security measures. Organizations should implement network segmentation to isolate these devices from general network traffic, ensuring that the printer's web interface is only accessible from trusted administrative networks. Network access control lists should be configured to restrict access to the printer's administrative ports, typically port 80 for HTTP services. Additionally, applying firmware updates from Bematech or Elgin is critical, as the vendor should have released patches addressing the input validation issues. Implementing web application firewalls or intrusion prevention systems can help detect and block malicious POST requests targeting this specific vulnerability. Regular security assessments of networked printer devices should be conducted to identify similar vulnerabilities, and organizations should establish protocols for immediate response to service disruptions, including backup procedures for critical transaction processing during outages.