CVE-2026-3678 Tenda FH451 AdvSetWan sub_3C434 stack-based overflow
A remote stack-based buffer overflow in the Tenda FH451 router allows attackers to execute arbitrary code via the AdvSetWan interface.
- 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-2026-3678?
CVE-2026-3678 is a high-severity memory corruption vulnerability in Tenda FH451, published on 7 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability was determined in Tenda FH451 1.0.0.9. Affected is the function sub_3C434 of the file /goform/AdvSetWan. This manipulation of the argument wanmode/PPPOEPassword causes stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been publicly disclosed and may be utilized.
Which versions are affected by CVE-2026-3678?
It affects 1 product.
Products include Tenda Fh451 Firmware.
How do I fix CVE-2026-3678?
No fix has been published for CVE-2026-3678 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-2026-3678 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-3678 exists.
Other vulnerabilities in Tenda FH451
Sources
Also known as GHSA-w4jv-rg29-ff2w.