CVE-2025-5839 Tenda AC9 POST Request AdvSetLanip fromadvsetlanip buffer overflow
Remote attackers can trigger a buffer overflow in the Tenda AC9 router via a crafted POST request, 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-2025-5839?
CVE-2025-5839 is a high-severity memory corruption vulnerability in Tenda Ac9 Firmware, published on 7 Jun 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability, which was classified as critical, has been found in Tenda AC9 15.03.02.13. Affected by this issue is the function fromadvsetlanip of the file /goform/AdvSetLanip of the component POST Request Handler. The manipulation of the argument lanMask leads to buffer overflow. The attack may be launched remotely. The exploit has been disclosed to the public and may be used.
Which versions are affected by CVE-2025-5839?
It affects 1 product.
Products include Tenda Ac9 Firmware.
How do I fix CVE-2025-5839?
No fix has been published for CVE-2025-5839 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-2025-5839 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-5839 exists.
Other vulnerabilities in Tenda Ac9 Firmware
Sources
Also known as GHSA-xpmp-hffj-q43q.