CVE-1999-1061 in LaserJet
Summary
by MITRE
HP Laserjet printers with JetDirect cards, when configured with TCP/IP, can be configured without a password, which allows remote attackers to connect to the printer and change its IP address or disable logging.
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Analysis
by VulDB Data Team • 04/17/2026
The vulnerability described in CVE-1999-1061 represents a critical security flaw in HP LaserJet printers equipped with JetDirect network cards. This issue stems from the default configuration practices that allow these network-enabled devices to operate without authentication mechanisms. The vulnerability specifically affects printers configured with TCP/IP protocols where the absence of password protection creates an attack surface that remote adversaries can exploit to gain unauthorized access to the printer's administrative functions. The flaw exists at the network protocol level where the printer's web interface and configuration services lack proper authentication controls, enabling any remote user to establish connections and modify critical printer settings. This vulnerability falls under the category of inadequate authentication as classified by CWE-287, which addresses improper handling of authentication credentials and access controls.
The technical exploitation of this vulnerability occurs through network-based attacks targeting the printer's TCP/IP interface. Attackers can remotely connect to the printer's network services without requiring authentication credentials, allowing them to perform administrative functions such as changing the printer's IP address configuration or disabling logging capabilities. This manipulation can result in complete loss of network connectivity for the printer, disruption of printing services, or even redirection of print jobs to unauthorized destinations. The vulnerability is particularly concerning because it affects the fundamental network management functions of the device, essentially allowing attackers to take control of the printer's network configuration and operational parameters. The lack of authentication mechanisms means that any device on the network can potentially exploit this vulnerability, making it a significant risk for enterprise environments where printer security is often overlooked.
The operational impact of CVE-1999-1061 extends beyond simple network configuration changes and can severely disrupt business operations in enterprise environments. When attackers disable logging functions, they remove crucial audit trails that organizations rely on for security monitoring and compliance purposes. The ability to change IP addresses can cause network disruption, as other devices may lose connectivity to the printer or experience routing issues. Additionally, the vulnerability can be leveraged as a stepping stone for more sophisticated attacks, as compromised printers can serve as entry points for lateral movement within the network. This vulnerability aligns with several tactics described in the MITRE ATT&CK framework, particularly those related to initial access through network services and privilege escalation by leveraging compromised network devices. The vulnerability also demonstrates the importance of network segmentation and proper device hardening practices as outlined in various cybersecurity frameworks and guidelines.
Organizations can mitigate this vulnerability by implementing several defensive measures that address both immediate remediation and long-term security posture improvements. The most direct mitigation involves configuring printer access controls to enforce authentication before allowing administrative access to the printer's web interface. This includes setting strong passwords for printer administration functions and ensuring that network services are properly secured. Network administrators should also implement proper network segmentation to isolate printer networks from critical business systems, reducing the potential impact of a compromised device. Regular security audits of networked devices should be conducted to identify and remediate similar vulnerabilities across the enterprise. The vulnerability underscores the importance of following security best practices for networked devices as outlined in various industry standards and frameworks, including the NIST Cybersecurity Framework and ISO 27001 requirements for information security management. Additionally, organizations should consider implementing network monitoring solutions that can detect unusual printer network activity and alert security teams to potential exploitation attempts.