CVE-2025-12209 Tenda O3 setDhcpConfig GetValue stack-based overflow
Remote attackers can trigger a stack-based buffer overflow in the Tenda O3 router's DHCP configuration handler, potentially leading to code execution or service disruption.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-12209?
CVE-2025-12209 is a high-severity memory corruption vulnerability in Tenda O3, published on 27 Oct 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability was determined in Tenda O3 1.0.0.10(2478). Affected is the function SetValue/GetValue of the file /goform/setDhcpConfig. Executing a manipulation of the argument dhcpEn can lead to stack-based buffer overflow. The attack may be performed from remote. The exploit has been publicly disclosed and may be utilized.
Which versions are affected by CVE-2025-12209?
It affects 1 product.
Products include Tenda O3 Firmware1.0.0.10\(2478\).
How do I fix CVE-2025-12209?
No fix has been published for CVE-2025-12209 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-12209 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-12209 exists.
Other vulnerabilities in Tenda O3
- CVE-2025-12210 Tenda O3 AdvSetLanip GetValue stack-based overflow
- CVE-2025-12211 Tenda O3 setDmzInfo GetValue stack-based overflow
- CVE-2025-12212 Tenda O3 setNetworkService GetValue stack-based overflow
- CVE-2025-12213 Tenda O3 setVlanConfig GetValue stack-based overflow
- CVE-2025-12214 Tenda O3 sysAutoReboot GetValue stack-based overflow
Sources
Also known as GHSA-q7mg-7pgv-5gh9.