CVE-2026-76582

Deferred Deferred - Pending Action

Command Injection in TRENDnet TEW-821DAP Router

Publication date: 2026-08-19

Last updated on: 2026-08-21

Assigner: VulDB

Description

A vulnerability was determined in TRENDnet TEW-821DAP 2.2.01b05. Affected is the function popen/system of the file /cgi-bin/ping.cgi of the component ssi. Executing a manipulation of the argument ipaddr can lead to command injection. It is possible to launch the attack remotely. The exploit has been publicly disclosed and may be utilized.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-08-19

Last Modified

2026-08-21

Generated

2026-09-09

AI Q&A

2026-08-20

EPSS Evaluated

2026-09-07

NVD

CVE-2026-76582

EUVD

EUVD-2026-62852

Affected Vendors & Products

Vendor	Product	Version / Range
trendnet	tew-821dap	2.2.01b05

Helpful Resources

Exploitability

CWE

KEV

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-74	The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.

Attack-Flow Graph

Executive Summary

This vulnerability is a command injection flaw in TRENDnet TEW-821DAP version 2.2.01b05. It exists in the /cgi-bin/ping.cgi file's ssi component. An attacker can manipulate the ipaddr argument to inject and execute arbitrary commands on the device remotely.

Detection Guidance

To detect this vulnerability, scan for the presence of TRENDnet TEW-821DAP devices running firmware version 2.2.01b05. Check if the /cgi-bin/ping.cgi endpoint is accessible and test for command injection by sending crafted input to the ipaddr parameter. Use network scanners like Nmap to identify vulnerable devices.

Impact Analysis

An attacker could gain unauthorized access to the device, execute malicious commands, potentially steal data, or disrupt device operations. Since it's remotely exploitable, users of affected devices are at risk without direct interaction.

Compliance Impact

This vulnerability allows remote command injection via manipulation of the ipaddr argument in the ping.cgi component. Such unauthorized remote execution could lead to unauthorized data access, modification, or exfiltration, which may violate GDPR's data protection requirements or HIPAA's safeguards for protected health information.

Mitigation Strategies

Immediately update the TRENDnet TEW-821DAP firmware to the latest version. Disable remote access to the /cgi-bin/ping.cgi endpoint if possible. Implement network segmentation to isolate vulnerable devices. Monitor network traffic for suspicious activity targeting this endpoint.

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