CVE-2026-3301

CRITICAL
2026-02-27 [email protected]
9.8
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Analysis Generated
Mar 12, 2026 - 21:55 vuln.today
PoC Detected
Feb 27, 2026 - 15:36 vuln.today
Public exploit code
CVE Published
Feb 27, 2026 - 06:18 nvd
CRITICAL 9.8

Tags

Command Injection N300rh Firmware

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.

Analysis

Command injection in TOTOLINK N300RH router firmware 6.1c.1353 via setDiagnosisCfg handler. EPSS 4.0% with PoC available — high exploitation probability for consumer routers.

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Remediation

Within 24 hours: Audit all Totolik N300RH devices in production and isolate any confirmed instances from critical networks. Within 7 days: Implement network segmentation to restrict administrative access to the affected devices and deploy WAF rules blocking /cgi-bin/cstecgi.cgi requests. …

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Priority Score

73
Low Medium High Critical
KEV: 0
EPSS: +4.0
CVSS: +49
POC: +20

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CVE-2026-3301 vulnerability details – vuln.today
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