CVE-2026-2167
Analyzed Analyzed - Analysis Complete
OS Command Injection in Totolink WA300 setAPNetwork Function

Publication date: 2026-02-08

Last updated on: 2026-04-29

Assigner: VulDB

Description
A vulnerability was detected in Totolink WA300 5.2cu.7112_B20190227. The impacted element is the function setAPNetwork of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument Ipaddr results in os command injection. The attack may be performed from remote. The exploit is now public and may be used.
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Meta Information
Published
2026-02-08
Last Modified
2026-04-29
Generated
2026-06-16
AI Q&A
2026-02-08
EPSS Evaluated
2026-06-15
NVD
CVE-2026-2167
EUVD
EUVD-2026-5782
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
totolink wa300_firmware 5.2cu.7112_b20190227
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-77 The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.
CWE-78 The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.
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Impact Analysis

This vulnerability allows remote attackers to execute arbitrary system commands with root privileges on the affected Totolink WA300 router. This can lead to a full compromise of the device.

  • Attackers can gain unauthorized root-level access.
  • Confidentiality, integrity, and availability of the device can be severely impacted.
  • Attackers can manipulate device settings, access sensitive data, or disrupt network operations.
  • The exploit is publicly available, making it easier for attackers to target vulnerable devices.
Executive Summary

CVE-2026-2167 is a critical OS command injection vulnerability found in the Totolink WA300 router, firmware version 5.2cu.7112_B20190227. The flaw exists in the setAPNetwork function within the /cgi-bin/cstecgi.cgi file. It occurs because the Ipaddr parameter in POST requests is not properly sanitized or validated, allowing attackers to inject shell commands.

When an attacker sends a specially crafted request with malicious input in the Ipaddr parameter, the router concatenates this input directly into system commands without filtering. This enables remote attackers to execute arbitrary commands with root privileges on the device, leading to full compromise.

Compliance Impact

I don't know

Detection Guidance

[{'type': 'paragraph', 'content': 'This vulnerability can be detected by sending crafted POST requests to the endpoint /cgi-bin/cstecgi.cgi targeting the setAPNetwork function, specifically manipulating the Ipaddr parameter to check for command injection.'}, {'type': 'paragraph', 'content': 'A practical detection method is to send a POST request with the Ipaddr parameter containing a shell command, such as `ls>/1.txt`. If the file /1.txt is created on the device, it confirms the vulnerability and remote command execution capability.'}, {'type': 'paragraph', 'content': 'Example command using curl to test the vulnerability:'}, {'type': 'list_item', 'content': "curl -X POST http://[router-ip]/cgi-bin/cstecgi.cgi -d 'action=setAPNetwork&Ipaddr=`ls>/1.txt`'"}, {'type': 'paragraph', 'content': 'After running the above command, check the device filesystem for the presence of /1.txt to confirm successful command injection.'}] [2]

Mitigation Strategies

[{'type': 'paragraph', 'content': 'No official patch or fix has been provided by the vendor for this vulnerability.'}, {'type': 'paragraph', 'content': 'Immediate mitigation steps include:'}, {'type': 'list_item', 'content': "Restrict remote access to the router's web interface, especially blocking access to /cgi-bin/cstecgi.cgi."}, {'type': 'list_item', 'content': 'Disable or limit the use of the setAPNetwork function if possible.'}, {'type': 'list_item', 'content': 'Monitor network traffic for suspicious POST requests targeting the Ipaddr parameter.'}, {'type': 'list_item', 'content': 'Consider replacing the affected Totolink WA300 device with a more secure alternative.'}] [3]

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