CVE-2025-9781 TOTOLINK A702R formFilter sub_4162DC buffer overflow
Remote attackers can trigger a buffer overflow in the TOTOLINK A702R router's formFilter function, 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-2025-9781?
CVE-2025-9781 is a high-severity memory corruption vulnerability in TOTOLINK A702R, published on 1 Sep 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability has been found in TOTOLINK A702R 4.0.0-B20211108.1423. This affects the function sub_4162DC of the file /boafrm/formFilter. Such manipulation of the argument ip6addr 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-2025-9781?
It affects 1 product.
Products include Totolink A702r Firmware.
How do I fix CVE-2025-9781?
No fix has been published for CVE-2025-9781 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-2025-9781 being exploited?
There is no known exploitation of CVE-2025-9781 in the wild and no public exploit code.
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-2025-9782 TOTOLINK A702R formOneKeyAccessButton sub_4466F8 buffer overflow
- CVE-2025-9783 TOTOLINK A702R formParentControl sub_418030 buffer overflow
- CVE-2025-8136 TOTOLINK A702R HTTP POST Request formFilter buffer overflow
Sources
Also known as GHSA-hrwv-wp54-9562.