High · published November 20, 2025
⚡ A remote attack can trigger a stack-based buffer overflow in Tenda AC21 routers! The vulnerable file, /goform/SetSysTimeCfg, makes it surprisingly easy for an attacker to exploit the timezone settings. 🔥 Think of this as a restaurant with a faulty reservation system — if a diner can tamper with the booking times, they might just push their dinner plans to the front of the queue, disrupting everything behind them. In this case, malicious input could overflow the system's capacity, leading to chaos! An attacker could remotely manipulate the system, potentially gaining control over the router, altering configurations, or executing arbitrary code. This could lead to a total breakdown of network security, putting all connected devices at risk. Imagine having someone at the helm, changing your network settings at will — not a pleasant thought!
Think of this as a restaurant with a faulty reservation system — if a diner can tamper with the booking times, they might just push their dinner plans to the front of the queue, disrupting everything behind them. In this case, malicious input could overflow the system's capacity, leading to chaos! This vulnerability allows remote attackers to exploit the stack-based buffer overflow by manipulating the 'timeZone' parameter in the /goform/SetSysTimeCfg endpoint, resulting in unintended memory access and potential execution of malicious code.
An attacker could remotely manipulate the system, potentially gaining control over the router, altering configurations, or executing arbitrary code. This could lead to a total breakdown of network security, putting all connected devices at risk. Imagine having someone at the helm, changing your network settings at will — not a pleasant thought! To mitigate this risk, update the firmware of Tenda AC21 routers to the latest version immediately. Additionally, ensure that input validation measures are in place to check for malicious data. Regularly audit your network settings to spot any unusual configurations. 🛡️ You've got this! Stay vigilant, follow these steps, and secure your network like the hero you are! 💪✨
| Product | Versions | Fixed in |
|---|---|---|
| tenda/ac21_firmware | all versions | — |