CVE-2026-77988
Received Received - Intake

Command Injection in TRENDnet TEW-823DRU Router

Publication date: 2026-08-22

Last updated on: 2026-08-22

Assigner: VulDB

Description
A weakness has been identified in TRENDnet TEW-823DRU 1.1.02b01. This vulnerability affects the function nvram_get of the component CLI Configuration Tool. This manipulation causes command injection. The attack is possible to be carried out remotely. The exploit has been made available to the public and could be used for attacks.

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Meta Information

Published
2026-08-22
Last Modified
2026-08-22
Generated
2026-08-22
AI Q&A
2026-08-22
EPSS Evaluated
N/A
NVD
CVE-2026-77988
EUVD
EUVD-2026-64252

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
trendnet tew-823dru 1.1.02b01

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-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

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Executive Summary

CVE-2026-77988 is a command injection vulnerability in TRENDnet TEW-823DRU router firmware v1.1.02b01. The flaw exists in the bin/cli binary which handles CLI configuration via telnet or SSH. User-supplied NVRAM values are retrieved using nvram_get() and passed unsanitized to system() or popen(), allowing arbitrary shell command execution.

Detection Guidance

Check if the TRENDnet TEW-823DRU router is running firmware version v1.1.02b01. Inspect network traffic for unusual CLI commands sent to telnet (port 23) or SSH. Monitor logs for suspicious system calls or unauthorized command executions.

Impact Analysis

An attacker with CLI access (LAN or WAN if enabled) can exploit this to gain root privileges and execute arbitrary commands. This could lead to reading sensitive files like /etc/shadow, installing backdoors, modifying firewall rules, or causing denial of service. The attack surface is large due to 23 injection points in IPv6 settings.

Compliance Impact

This vulnerability allows remote attackers to execute arbitrary commands with root privileges on the affected TRENDnet TEW-823DRU router. Such unauthorized access could lead to unauthorized data access, modification, or exfiltration, violating GDPR's data protection requirements and HIPAA's security rules for protected health information.

Mitigation Strategies

Disable WAN-side CLI access, restrict LAN access to trusted users, update to the latest firmware if available, and monitor for suspicious commands. Avoid using default credentials and implement strong authentication.

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