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%.

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 TOTOLINK

9.8

CVSS 3.1 · NVD

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

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 Assessment

Weakness	CWE CWE-77 OWASP Top 10:2025 A05:2025 - Injection ASVS 5.0 V1 - Encoding and Sanitization Command injection prevention MITRE ATT&CK 1 technique across 1 tactic: Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Exploitation Conditions	Totolik N300RH firmware 6.1c.1353_B20190305 with Web Management Interface enabled. No authentication required. Default configuration vulnerable to remote unauthenticated exploitation via /cgi-bin/cstecgi.cgi endpoint.
Impact	CVSS 9.8, EPSS 4.0%. TOTOLINK routers are frequently targeted by botnets and have a history of command injection vulnerabilities.
Exploit ScenarioDerived	Attacker accesses router web interface (often default credentials), injects commands through diagnostic configuration, gains persistent shell access, enrolls device in botnet.

Act Now Prioritize within 24-48h. Why: CRITICAL severity + public POC available.

No patch listed yet 4.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

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.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:55 CVSS 9.8

Command injection in TOTOLINK router diagnostic function.

RemediationAI

Update firmware. Change default credentials. Disable WAN-side management access.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

CWE-77 in TOTOLINK N300RH setDiagnosisCfg handler. User input is passed to system commands without sanitization in the diagnostic configuration.

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Exploit and PoC references, threat intelligence from 22 sources

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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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

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.

Executive ViewAI

Why It Matters

A critical remote code execution vulnerability (CVSS 9.8) affects Totolik N300RH routers with publicly available exploits and no vendor patch. Organizations using this device model face immediate risk of unauthorized network access, data theft, and lateral movement into corporate infrastructure.

Business Impact: Severe

Compensating Controls

Implement network segmentation isolating affected devices; restrict administrative web interface access via firewall rules and IP whitelisting; disable remote management if operationally feasible; deploy WAF rules to block requests to /cgi-bin/cstecgi.cgi; monitor for exploitation attempts via IDS/IPS; consider device replacement pending vendor patch availability; disable unused wireless features until patch is available.

Threat Intelligence Overview

EPSS Score

4.0%

Top 12% exploitable

Exploit

POC

Public exploit code exists

Data Quality

5 sources

Confidence: Medium

NVD

CVE.org

EPSS

GitHub

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity CRITICAL

CISA KEV No

Public POC Yes

EPSS 4.0%

Patch available No

Active threat No

Deciding rule

CRITICAL severity + public POC available

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.