CVE-2025-8139 TOTOLINK A702R HTTP POST Request formPortFw buffer overflow
Remote attackers can trigger a buffer overflow in the TOTOLINK A702R router via HTTP POST requests, 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-2025-8139?
CVE-2025-8139 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 classified as critical. This affects an unknown part of the file /boafrm/formPortFw of the component HTTP POST Request Handler. The manipulation of the argument service_type leads to buffer overflow. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used.
Which versions are affected by CVE-2025-8139?
It affects 1 product.
Products include Totolink A702r Firmware.
How do I fix CVE-2025-8139?
No fix has been published for CVE-2025-8139 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-2025-8139 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-8139 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-862h-mghm-42j7.