CVE-2026-11554 in CP450
Summary
by MITRE • 06/08/2026
A vulnerability was determined in TOTOLINK CP450 4.1.0cu.747. This vulnerability affects unknown code of the file /etc/vsftpd.conf of the component vsftpd. This manipulation causes least privilege violation. The attack may be initiated remotely. The exploit has been publicly disclosed and may be utilized.
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Analysis
by VulDB Data Team • 06/08/2026
The vulnerability identified in TOTOLINK CP450 version 4.1.0cu.747 represents a critical security flaw within the vsftpd component configuration file located at /etc/vsftpd.conf. This issue stems from improper privilege management where the vulnerable code fails to enforce proper access controls, allowing unauthorized manipulation of the ftp daemon configuration. The flaw specifically targets the vsftpd service which is a widely deployed ftp server implementation that governs file transfer operations within network environments. The vulnerability's presence in the configuration file indicates a potential misconfiguration that could permit unauthorized users to modify critical ftp service parameters, thereby compromising the integrity and security of the file transfer infrastructure.
The technical exploitation of this vulnerability occurs through remote attack vectors, enabling adversaries to manipulate the vsftpd configuration without requiring local system access or elevated privileges. This remote exploit capability significantly amplifies the threat surface as attackers can initiate the attack from external network positions without physical access to the device. The least privilege violation manifests when the system fails to properly restrict configuration modifications to authorized administrators only, allowing potential attackers to alter ftp service behavior through the manipulation of the /etc/vsftpd.conf file. This misconfiguration creates opportunities for attackers to disable security features, modify authentication mechanisms, or redirect ftp traffic to malicious endpoints.
The operational impact of this vulnerability extends beyond simple configuration changes as it fundamentally compromises the trust model of the ftp service implementation. When attackers can manipulate vsftpd configuration parameters remotely, they gain the ability to potentially establish persistent access points, disable logging mechanisms, or modify user access controls. The public disclosure of this exploit means that threat actors have readily available tools and techniques to leverage this weakness against affected devices. This vulnerability directly relates to CWE-276 which addresses improper file permissions and access control violations, and aligns with ATT&CK technique T1078.002 which covers valid accounts with restricted access. The attack surface includes network scanning activities targeting devices running the vulnerable firmware version, with exploitation potentially leading to complete system compromise through ftp service manipulation.
Mitigation strategies for this vulnerability should focus on immediate firmware updates from TOTOLINK to address the specific vsftpd configuration flaw, along with network segmentation to limit access to ftp services. Network administrators should implement strict access controls for the /etc/vsftpd.conf file, ensuring that only authorized personnel can modify ftp service parameters. Additional protective measures include disabling unnecessary ftp services where possible, implementing network monitoring for suspicious configuration changes, and conducting regular security assessments of ftp service configurations. The vulnerability also highlights the importance of secure configuration management practices, where configuration files should be protected through proper file permissions, access controls, and regular audit procedures to prevent unauthorized modifications that could lead to privilege escalation or service disruption.