CVE-2025-4849 TOTOLINK N300RH cstecgi.cgi CloudACMunualUpdateUserdata command injection
Remote attackers can execute arbitrary commands on TOTOLINK N300RH routers via the CloudACMunualUpdateUserdata function in cstecgi.cgi.
- 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-2025-4849?
CVE-2025-4849 is a medium-severity command injection vulnerability in TOTOLINK N300RH, published on 18 May 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 N300RH 6.1c.1390_B20191101. It has been rated as critical. Affected by this issue is the function CloudACMunualUpdateUserdata of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument url leads to command injection. The attack may be launched remotely. The exploit has been disclosed to the public and may be used.
Which versions are affected by CVE-2025-4849?
It affects 1 product.
Products include Totolink N300rh Firmware.
How do I fix CVE-2025-4849?
No fix has been published for CVE-2025-4849 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2025-4849 being exploited?
There is no known exploitation of CVE-2025-4849 in the wild and no public exploit code.
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-2025-4850 TOTOLINK N300RH cstecgi.cgi setUnloadUserData command injection
- CVE-2025-4851 TOTOLINK N300RH cstecgi.cgi setUploadUserData command injection
Sources
Also known as GHSA-7f4f-7v48-7gv6.