CVE-2024-51977 is a vulnerability identified in the Brother Industries HL-L8260CDN printer model, classified under CWE-538, which pertains to the insertion of sensitive information into an externally accessible file or directory. The flaw allows an unauthenticated attacker to retrieve sensitive device information by accessing the URI path /etc/mnt_info.csv via a simple HTTP GET request on any of the device's exposed services: HTTP (port 80), HTTPS (port 443), or IPP (port 631). The response is a CSV-formatted file containing details such as the printer's model number, firmware version, IP address, and serial number. This information leakage occurs without any authentication or user interaction, making it trivially exploitable by anyone with network access to the device. Although the vulnerability does not permit modification of device settings or disruption of services, the exposed data can facilitate further attacks by providing attackers with valuable reconnaissance information. The vulnerability was published on June 25, 2025, and currently, there are no known exploits in the wild. The CVSS v3.1 base score is 5.3, indicating a medium severity primarily due to confidentiality impact without affecting integrity or availability. No patches or firmware updates have been linked yet, so mitigation relies on network-level controls and monitoring.

The primary impact of CVE-2024-51977 is the unauthorized disclosure of sensitive device information, including model, firmware version, IP address, and serial number. This information can be leveraged by attackers to identify vulnerable devices, tailor exploits, or conduct targeted attacks such as firmware tampering, network reconnaissance, or social engineering. While the vulnerability does not directly compromise device integrity or availability, the leaked data lowers the barrier for subsequent attacks that could lead to more severe consequences. Organizations with exposed HL-L8260CDN printers on accessible networks risk information leakage that could facilitate lateral movement or escalation in a broader attack campaign. The impact is particularly relevant in environments where printers are connected to sensitive or segmented networks, as attackers could use this information to map network assets or identify outdated firmware versions susceptible to other vulnerabilities. Since no authentication is required, any attacker with network access can exploit this flaw, increasing the risk in poorly segmented or publicly accessible network environments.

To mitigate CVE-2024-51977, organizations should implement the following specific measures: 1) Restrict network access to the printer’s management interfaces (HTTP, HTTPS, IPP) by applying firewall rules or network segmentation to limit exposure only to trusted administrative hosts. 2) Disable or restrict IPP and web services on the printer if not required for business operations. 3) Monitor network traffic for unauthorized access attempts to the /etc/mnt_info.csv URI and implement intrusion detection/prevention rules to alert on or block such requests. 4) Regularly audit printer firmware versions and configurations to identify devices running vulnerable versions and apply vendor patches or firmware updates as soon as they become available. 5) Employ network access controls such as VLANs or NAC solutions to isolate printers from general user networks, reducing the attack surface. 6) Consider using VPN or secure management channels for remote printer administration to prevent direct exposure of management interfaces. 7) Maintain an inventory of all Brother HL-L8260CDN devices and verify their exposure status to prioritize remediation efforts. These targeted controls go beyond generic advice by focusing on limiting access to vulnerable services and proactive monitoring.