CVE-2025-6401 TOTOLINK N300RH HTTP POST Message formFilter denial of service
An attacker can cause a denial of service on TOTOLINK N300RH routers by manipulating the url argument in the HTTP POST Message Handler.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-6401?
CVE-2025-6401 is a medium-severity denial of service vulnerability in TOTOLINK N300RH, published on 21 Jun 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability was found in TOTOLINK N300RH 6.1c.1390_B20191101. It has been classified as problematic. This affects an unknown part of the file /boafrm/formFilter of the component HTTP POST Message Handler. The manipulation of the argument url leads to denial of service. The exploit has been disclosed to the public and may be used.
Weakness: CWE-404
Which versions are affected by CVE-2025-6401?
It affects 1 product.
Products include Totolink N300rh Firmware.
How do I fix CVE-2025-6401?
No fix has been published for CVE-2025-6401 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-6401 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-6401 exists.
Other vulnerabilities in TOTOLINK N300RH
- CVE-2026-3301 Totolink N300RH Web Management cstecgi.cgi setWebWlanIdx os command injection
- CVE-2025-6400 TOTOLINK N300RH HTTP POST Message formPortFw buffer overflow
- CVE-2026-3696 Totolink N300RH CGI cstecgi.cgi setWiFiWpsConfig os command injection
- CVE-2025-4849 TOTOLINK N300RH cstecgi.cgi CloudACMunualUpdateUserdata command injection
- CVE-2025-4850 TOTOLINK N300RH cstecgi.cgi setUnloadUserData command injection
Sources
Also known as GHSA-vvr6-g6xc-j272.