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CVE-2021-34730 is a vulnerability in the Universal Plug-and-Play (UPnP) service of Cisco Small Business RV110W, RV130, RV130W, and RV215W Routers. The vulnerability arises from improper validation of incoming UPnP traffic, allowing an unauthenticated, remote attacker to send crafted UPnP requests to the device. Successful exploitation enables arbitrary code execution as root or causes a device reload, leading to denial of service.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos (1 hidden).
This repository contains a detailed analysis and working exploit for a 0day stack buffer overflow vulnerability in the UPnP service of Cisco RV110W routers (firmware 1.2.2.8). The exploit (exp.py) is a Python script that interacts with the target device's UPnP service over the network. It first discovers the device using SSDP (Simple Service Discovery Protocol) multicast requests, then crafts a malicious SOAP AddPortMapping request with an overlong NewPortMappingDescription parameter. This triggers a stack buffer overflow in the device's UPnP service, allowing the attacker to overwrite the return address and execute arbitrary system commands. The provided payload starts a telnet server on the device, granting the attacker remote shell access. The README.md provides a comprehensive technical walkthrough, including reverse engineering steps, debugging, and exploitation methodology. The exploit requires the attacker to be on the same network as the target device with UPnP enabled. The repository is operational and provides a working exploit for remote code execution on vulnerable Cisco RV110W routers.
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