CVE-2025-12611 Tenda AC21 SetPptpServerCfg formSetPPTPServer buffer overflow
A buffer overflow in the Tenda AC21 router allows remote attackers to execute arbitrary code or cause a denial of service via the SetPptpServerCfg endpoint.
- 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-2025-12611?
CVE-2025-12611 is a high-severity memory corruption vulnerability in Tenda AC21, published on 3 Nov 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability was identified in Tenda AC21 16.03.08.16. This vulnerability affects the function formSetPPTPServer of the file /goform/SetPptpServerCfg. The manipulation of the argument startIp leads to buffer overflow. Remote exploitation of the attack is possible. The exploit is publicly available and might be used.
Which versions are affected by CVE-2025-12611?
It affects 1 product.
Products include Tenda Ac21 Firmware.
How do I fix CVE-2025-12611?
No fix has been published for CVE-2025-12611 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-2025-12611 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-12611 exists.
Other vulnerabilities in Tenda AC21
- CVE-2025-9605 Tenda AC21/AC23 GetParentControlInfo stack-based overflow
- CVE-2023-24333 Command injection in n/a
- CVE-2026-4565 Tenda AC21 SetNetControlList formSetQosBand buffer overflow
- CVE-2026-1637 Tenda AC21 AdvSetMacMtuWan fromAdvSetMacMtuWan stack-based overflow
- CVE-2025-13445 Tenda AC21 SetIpMacBind stack-based overflow
Sources
Also known as GHSA-rfpm-frcg-62rg.