CVE-2025-7421 Tenda O3V2 httpd operateMacFilter fromMacFilterModify stack-based overflow
Remote attackers can trigger a stack-based buffer overflow in the Tenda O3V2 router's httpd service via the mac argument, potentially leading to code execution.
- 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-2025-7421?
CVE-2025-7421 is a high-severity memory corruption vulnerability in Tenda O3V2, published on 11 Jul 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability was found in Tenda O3V2 1.0.0.12(3880). It has been rated as critical. This issue affects the function fromMacFilterModify of the file /goform/operateMacFilter of the component httpd. The manipulation of the argument mac leads to stack-based buffer overflow. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used.
Which versions are affected by CVE-2025-7421?
It affects 1 product.
Products include Tenda O3 Firmware.
How do I fix CVE-2025-7421?
No fix has been published for CVE-2025-7421 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-2025-7421 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-7421 exists.
Other vulnerabilities in Tenda O3V2
- CVE-2025-55613 Memory corruption in n/a
- CVE-2024-36604 Command injection in n/a
- CVE-2025-7422 Tenda O3V2 httpd setNetworkService setAutoReboot stack-based overflow
- CVE-2025-7423 Tenda O3V2 httpd setWrlFilterList formWifiMacFilterSet stack-based overflow
- CVE-2025-7416 Tenda O3V2 httpd setSysTimeInfo fromSysToolTime stack-based overflow
Sources
Also known as GHSA-m965-pw66-9w65.