High · published November 3, 2025
🚨 A crafty buffer overflow vulnerability haunts Tenda AC21 routers! 😱 With a simple argument manipulation, attackers can exploit this flaw remotely, putting your network at risk. Think of this like a delivery person who misreads an address and delivers a package to the wrong location — the mismanaged startIp argument creates a chaotic situation where attackers can infiltrate your network much like an unwanted guest getting access to sensitive areas. This vulnerability could allow attackers to take over the router, giving them the ability to intercept traffic, modify settings, or even execute arbitrary code. Imagine the devastation as they unlock the door to your entire network, leading to data breaches and compromised devices!
Think of this like a delivery person who misreads an address and delivers a package to the wrong location — the mismanaged startIp argument creates a chaotic situation where attackers can infiltrate your network much like an unwanted guest getting access to sensitive areas. The vulnerability exists in the function formSetPPTPServer of the /goform/SetPptpServerCfg file, where improper handling of the startIp argument leads to a buffer overflow, allowing attackers to execute malicious code remotely.
This vulnerability could allow attackers to take over the router, giving them the ability to intercept traffic, modify settings, or even execute arbitrary code. Imagine the devastation as they unlock the door to your entire network, leading to data breaches and compromised devices! To protect your network, patch the Tenda AC21 firmware to a secure version immediately! Additionally, disable PPTP server settings if they are not in use, and monitor network activity for any suspicious behavior. You've got this! Follow these steps, and you’ll have your network secured in no time! 🛡️
| Product | Versions | Fixed in |
|---|---|---|
| tenda/ac21_firmware | all versions | — |