CVE-2025-6940 TOTOLINK A702R HTTP POST Request formParentControl buffer overflow
Remote attackers can trigger a buffer overflow in the TOTOLINK A702R router's HTTP handler, potentially leading to code execution or privilege escalation.
- 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-2025-6940?
CVE-2025-6940 is a high-severity memory corruption vulnerability in TOTOLINK A702R, published on 1 Jul 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability classified as critical was found in TOTOLINK A702R 4.0.0-B20230721.1521. Affected by this vulnerability is an unknown functionality of the file /boafrm/formParentControl of the component HTTP POST Request Handler. The manipulation of the argument submit-url leads to buffer overflow. The attack can be launched remotely. The exploit has been disclosed to the public and may be used.
Which versions are affected by CVE-2025-6940?
It affects 1 product.
Products include Totolink A702r Firmware.
How do I fix CVE-2025-6940?
No fix has been published for CVE-2025-6940 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-2025-6940 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-6940 exists.
Other vulnerabilities in TOTOLINK A702R
- CVE-2025-9779 TOTOLINK A702R formFilter sub_4162DC buffer overflow
- CVE-2025-9780 TOTOLINK A702R formIpQoS sub_419BE0 buffer overflow
- CVE-2025-9781 TOTOLINK A702R formFilter sub_4162DC buffer overflow
- CVE-2025-9782 TOTOLINK A702R formOneKeyAccessButton sub_4466F8 buffer overflow
- CVE-2025-9783 TOTOLINK A702R formParentControl sub_418030 buffer overflow
Sources
Also known as GHSA-53q3-762m-2wvx.