CVE-2026-3301: Totolink N300RH Web Management cstecgi.cgi setWebWlanIdx os command injection

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 4.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-02-27 · updated 2026-06-17
Weakness: CWE-77

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.

Affected products

Totolink N300RH: 6.1c.1349_b20181018, 6.1c.1353_b20190305

References

https://github.com/xyh4ck/iot_poc/blob/main/TOTOLINK/N300RHv4/01_setWebWlanIdx_RCE/README.md
https://vuldb.com/?ctiid.348052
https://vuldb.com/?id.348052
https://vuldb.com/?submit.761297
https://www.totolink.net/

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