CVE-2025-8140 TOTOLINK A702R HTTP POST Request formWlanMultipleAP buffer overflow
Remote attackers can trigger a buffer overflow in the HTTP POST handler of TOTOLINK A702R routers, 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-2025-8140?
CVE-2025-8140 is a high-severity memory corruption vulnerability in TOTOLINK A702R, published on 25 Jul 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability was found in TOTOLINK A702R 4.0.0-B20230721.1521. It has been declared as critical. This vulnerability affects unknown code of the file /boafrm/formWlanMultipleAP of the component HTTP POST Request Handler. The manipulation of the argument submit-url leads to buffer overflow. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used.
Which versions are affected by CVE-2025-8140?
It affects 1 product.
Products include Totolink A702r Firmware.
How do I fix CVE-2025-8140?
No fix has been published for CVE-2025-8140 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-2025-8140 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-8140 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-4g9q-w72v-3543.