CVE-2026-3301Public exploitNetwork attack vector

Pre-auth root command execution via unsanitized webWlanIdx

Published Feb 27, 2026 · Updated Feb 27, 2026

OS command injection in TOTOLINK N300RH Firmware 6.1c.1353_B20190305 allows remote attackers to execute commands as root. The setWebWlanIdx handler reads the webWlanIdx HTTP parameter, inserts it unescaped into an echo command with sprintf, and passes the result to CsteSystem. Network reachability to the web management interface is sufficient; no authentication or user interaction is required, and successful exploitation grants full control of the router.

CVSS severity9.8
Critical
EPSS probability4.03%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in TOTOLINK N300RH Firmware 6.1c.1353_B20190305 allows remote attackers to execute commands as root. The setWebWlanIdx handler reads the webWlanIdx HTTP parameter, inserts it unescaped into an echo command with sprintf, and passes the result to CsteSystem. Network reachability to the web management interface is sufficient; no authentication or user interaction is required, and successful exploitation grants full control of the router.

The record

CVE
CVE-2026-3301
Published
Feb 27, 2026
Updated
Feb 27, 2026
Vendor
TOTOLINK
Product
N300RH Firmware
Classifications
CWE-77, CWE-78, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.1c.1353_B20190305

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

TOTOLINK · N300RH Firmwareversion=6.1c.1353_B20190305

Published CVSS scores

10.0VulDBAV:N/AC:L/Au:N/C:C/I:C/A:C
9.8VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.9VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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