Improper error handling in EX200 - CVE-2025-65606
Published: January 8, 2026
Vulnerability identifier: #VU121091
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2025-65606
CWE-ID: CWE-388
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: TOTOLINK
Affected software:
EX200
EX200
Detailed vulnerability description
The vulnerability allows an attacker to compromise the affected system.
The vulnerability exists due to an error in the firmware-upload logic that causes the device to unintentionally start an unauthenticated root-level telnet service in case of unsuccessful firmware update. A remote attacker can trick the victim into uploading malformed firmware files and full control over the device.
How to mitigate CVE-2025-65606
Cybersecurity Help is currently unaware of any official solution to address this vulnerability and the product is no longer supported by the vendor.