CVE-2026-8138 Tenda CX12L SetPptpServerCfg” formSetPPTPServer stack-based overflow
Remote attackers can trigger a stack-based buffer overflow in the Tenda CX12L router's PPTP server configuration handler, 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-2026-8138?
CVE-2026-8138 is a high-severity memory corruption vulnerability in Tenda CX12L, published on 8 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability was found in Tenda CX12L 16.03.53.12. This issue affects the function formSetPPTPServer of the file /goform/SetPptpServerCfg”. The manipulation results in stack-based buffer overflow. The attack can be executed remotely. The exploit has been made public and could be used.
Which versions are affected by CVE-2026-8138?
It affects 1 product.
Products include Tenda Cx12l Firmware.
How do I fix CVE-2026-8138?
No fix has been published for CVE-2026-8138 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-2026-8138 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-8138 exists.
Other vulnerabilities in Tenda CX12L
- CVE-2026-5685 Tenda CX12L addressNat fromAddressNat stack-based overflow
- CVE-2026-5686 Tenda CX12L RouteStatic fromRouteStatic stack-based overflow
- CVE-2026-5687 Tenda CX12L NatStaticSetting fromNatStaticSetting stack-based overflow
- CVE-2026-5684 Tenda CX12L webExcptypemanFilter fromwebExcptypemanFilter stack-based overflow
- CVE-2026-5683 Tenda CX12L P2pListFilter fromP2pListFilter stack-based overflow
Sources
Also known as GHSA-v5fc-fw74-r356.