CVE-2026-9514: Totolink CA750-PoE Setting cstecgi.cgi setNetworkDiag os command injection
A security vulnerability has been detected in Totolink CA750-PoE 6.2c.510. Impacted is the function setNetworkDiag of the file /cgi-bin/cstecgi.cgi of the component Setting Handler. The manipulation of the argument NetDiagHost/NetDiagPingNum/NetDiagPingSize/NetDiagPingTimeOut/NetDiagTracertHop is directly passed by the attacker/so we can control the NetDiagHost/NetDiagPingNum/NetDiagPingSize/NetDiagPingTimeOut/NetDiagTracertHop leads to os command injection. The attack may be initiated remotely. The exploit has been disclosed publicly and may be used.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Configuration
Disable the setNetworkDiag network diagnostic functionality or the cgi-bin/cstecgi.cgi diagnostic CGI if the device configuration allows, to prevent passing attacker-controlled NetDiag* arguments that lead to OS command injection.
Totolink CA750-PoE /cgi-bin/cstecgi.cgi (Setting Handler) setNetworkDiag (NetDiagHost / NetDiagPingNum / NetDiagPingSize / NetDiagPingTimeOut / NetDiagTracertHop) = disabled - Compensating control
Restrict access to device management and the /cgi-bin/cstecgi.cgi endpoint to trusted hosts only (firewall, ACLs or network segmentation). Block or disallow remote/WAN access to management interfaces where possible.
- Operational
Monitor for published exploit code and apply vendor-supplied firmware updates or patches for the Totolink CA750-PoE as soon as they become available; until a vendor fix is available, maintain the compensating controls above.
Event History
Frequently Asked Questions
What is the severity of CVE-2026-9514?
The severity of CVE-2026-9514 is medium with a score of 6.3.
How do I fix CVE-2026-9514?
To fix CVE-2026-9514, update the Totolink CA750-PoE device to the latest firmware version that addresses this vulnerability.
What components are affected by CVE-2026-9514?
CVE-2026-9514 affects the function setNetworkDiag in the file /cgi-bin/cstecgi.cgi of the Setting Handler component.
What type of vulnerability is CVE-2026-9514?
CVE-2026-9514 is classified as an OS command injection vulnerability.
What potential impact does CVE-2026-9514 have?
Exploitation of CVE-2026-9514 could allow an attacker to execute arbitrary commands on the affected device.