What is the CVSS score of CVE-2026-3301?

CVE-2026-3301 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 4.0%.

Which versions of N300rh Firmware are affected by CVE-2026-3301?

A critical remote code execution vulnerability (CVSS 9.8) affects Totolik N300RH routers with publicly available exploits and no vendor patch.

Is there a public PoC exploit available for CVE-2026-3301?

Yes, a public proof-of-concept exploit is available for CVE-2026-3301. Prioritise patching immediately. EPSS: 4.0%.

How to fix or mitigate CVE-2026-3301?

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. Within 30 days: Replace affected devices with patched alternatives or conduct vendor communications to obtain firmware updates; document all affected assets and remediation status.

N300rh Firmware CVE-2026-3301

CRITICAL

Command Injection (CWE-77)

2026-02-27 cna@vuldb.com

Command Injection N300rh Firmware

9.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

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

DescriptionCVE.org

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.

AnalysisAI

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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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

Send crafted HTTP request to /cgi-bin/cstecgi.cgi

Exploit

Inject OS command via webWlanIdx parameter

Execution

Execute arbitrary command with router privileges

Impact

Achieve complete system compromise

Access

Send crafted HTTP request to /cgi-bin/cstecgi.cgi

Exploit

Inject OS command via webWlanIdx parameter

Execution

Execute arbitrary command with router privileges

Impact

Achieve complete system compromise

Vulnerability AssessmentAI

Exploitation	Totolik N300RH firmware 6.1c.1353_B20190305 with Web Management Interface enabled. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	CVSS 9.8, EPSS 4.0%. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	Attacker accesses router web interface (often default credentials), injects commands through diagnostic configuration, gains persistent shell access, enrolls device in botnet.
Remediation	Update firmware. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours: Audit all Totolik N300RH devices in production and isolate any confirmed instances from critical networks. …

Threat intelligence, references, and detailed analysis are available after sign-in.

CVE-2026-3301 vulnerability details – vuln.today

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N300rh Firmware CVE-2026-3301

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

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Attack ChainAIDerived

Vulnerability AssessmentAI

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External POC / Exploit Code