A vulnerability, which was classified as critical, has been found in Tenda W15E 15.11.0.14. Affected by this issue is the function formSetPortMapping of the file /goform/SetPortMapping. The manipulation of the argument portMappingServer/portMappingProtocol/portMappingWan/porMappingtInternal/portMappingExternal leads to stack-based buffer overflow. Using CWE to declare the problem leads to CWE-121. The weakness was released 04/24/2024. The advisory is available at github.com. This vulnerability is handled as CVE-2024-4123. The attack may be launched remotely. Technical details are available. Furthermore, there is an exploit available. The exploit has been disclosed to the public and may be used. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment. It is declared as proof-of-concept. The exploit is available at github.com. As 0-day the estimated underground price was around $0-$5k. The vendor was contacted early about this disclosure but did not respond in any way. A possible mitigation has been published even before and not after the disclosure of the vulnerability.