CVE-2025-5863 Tenda AC5 SetRebootTimer formSetRebootTimer stack-based overflow

High 8.7 Published 9 Jun 2025 Updated 10 Jun 2025

A remote attacker can trigger a stack-based buffer overflow in the Tenda AC5 router's reboot timer function, potentially leading to arbitrary 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-2025-5863?

CVE-2025-5863 is a high-severity memory corruption vulnerability in Tenda AC5, published on 9 Jun 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 AC5 15.03.06.47. It has been classified as critical. Affected is the function formSetRebootTimer of the file /goform/SetRebootTimer. The manipulation of the argument rebootTime leads to stack-based buffer overflow. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used.

Weakness: CWE-121, CWE-787, CWE-119

Which versions are affected by CVE-2025-5863?

It affects 1 product.

Products include Tenda Ac5 Firmware.

How do I fix CVE-2025-5863?

No fix has been published for CVE-2025-5863 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-2025-5863 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-5863 exists.

Sources

Also known as GHSA-3xgx-5fr5-rcrq.