Critical severity · published Feb 27, 2026
CVE-2026-3301
Totolink N300RH Web Management cstecgi.cgi setWebWlanIdx os command injection
9.8
CVSS
4.4%
EPSS
No
On KEV
Description
A security flaw has been discovered in Totolink N300RH 6.1c.1353_B20190305. Affected by this vulnerability is the function setWebWlanIdx of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. Performing a manipulation of the argument webWlanIdx results in os command injection. The attack can be initiated remotely. The exploit has been released to the public and may be used for attacks.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)4.4% · higher than 91% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
N3
N300RH · Totolink
6.1c.1353_B20190305 · source: vendor
NF
N300rh Firmware · Totolink
6.1c.1349_b20181018; 6.1c.1353_b20190305 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-3301
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-3301
Exploit
https://github.com/xyh4ck/iot_poc/blob/main/TOTOLINK/N300RHv4/01_setWebWlanIdx_RCE/README.md
Permissions Required
https://vuldb.com/?ctiid.348052
Third Party Advisory
https://vuldb.com/?id.348052
Third Party Advisory
https://vuldb.com/?submit.761297
Product
https://www.totolink.net/
More from N300RH
9.8
CVE-2026-10187
Totolink N300RH Web Management wireless.so setWiFiBasicConfig stack-based overflow
9.8
CVE-2026-9543
Totolink N300RH Web Management cstecgi.cgi setPasswordCfg os command injection
9.8
CVE-2026-7747
Totolink N300RH Parameter cstecgi.cgi loginauth buffer overflow
9.8
CVE-2026-3696
Totolink N300RH CGI cstecgi.cgi setWiFiWpsConfig os command injection
9.8
CVE-2025-4851
A vulnerability classified as critical was found in TOTOLINK N300RH 6.1c.1390_B20191101