CVE-2026-3696Public exploitNetwork attack vector

Unauthenticated root command execution via unsanitized WPS PIN

Published Mar 8, 2026 · Updated Mar 8, 2026

OS command injection in the CGI Handler of TOTOLINK N300RH Firmware 6..1c.1353_B20190305 allows remote attackers to execute commands as root. The setWiFiWpsConfig function in /cgi-bin/cstecgi.cgi inserts the HTTP PIN parameter into a hostapd_cli shell command with sprintf and passes the result to CsteSystem without validation or escaping. No authentication or user interaction is required, but the router's web management interface must be reachable from the attacker's network location.

CVSS severity7.3
High
EPSS probability2.11%
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 the CGI Handler of TOTOLINK N300RH Firmware 6..1c.1353_B20190305 allows remote attackers to execute commands as root. The setWiFiWpsConfig function in /cgi-bin/cstecgi.cgi inserts the HTTP PIN parameter into a hostapd_cli shell command with sprintf and passes the result to CsteSystem without validation or escaping. No authentication or user interaction is required, but the router's web management interface must be reachable from the attacker's network location.

The record

CVE
CVE-2026-3696
Published
Mar 8, 2026
Updated
Mar 8, 2026
Vendor
TOTOLINK
Product
N300RH Firmware
Classifications
CWE-78, CWE-77, T1059.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 8, 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

7.5VulDBAV:N/AC:L/Au:N/C:P/I:P/A:P
5.5VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

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-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1059.004Command and Scripting Interpreter: Unix Shell

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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