CVE-2026-38711 in TR1200
Summary
by MITRE • 07/31/2026
TR1200 v2.4.15, TR3000 v2.4.21, WR300 v2.4.25, WR1200 v2.4.23, WR1300 v2.4.22, WR1500 v2.3.10, WR3000 v2.4.19, WR3600 v2.3.16, and WR6500 v2.3.15 were discovered to contain a command injection vulnerability in the system.upgrade_check interface. This vulnerability allows attackers to execute arbitrary commands as root via a crafted input.
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Analysis
by VulDB Data Team • 08/01/2026
This vulnerability represents a critical command injection flaw affecting multiple wireless router models from TR1200 to WR6500 series, all running firmware versions up to specified patches. The vulnerability exists within the system.upgrade_check interface which serves as an endpoint for checking software updates. When exploited, this flaw enables remote attackers to inject malicious commands that execute with root privileges, effectively providing complete system compromise. The vulnerability stems from insufficient input validation and sanitization within the upgrade check functionality, allowing crafted payloads to bypass normal security controls and directly execute operating system commands.
The technical exploitation of this vulnerability follows established patterns for command injection attacks, where attacker-controlled input is concatenated into system execution calls without proper escaping or filtering mechanisms. This type of flaw typically maps to CWE-77 Command Injection within the Common Weakness Enumeration framework, which specifically addresses situations where user-supplied data is directly incorporated into shell commands without adequate sanitization. The attack vector leverages the fact that the system.upgrade_check interface accepts external input parameters that are subsequently processed through shell execution functions, creating an ideal environment for command injection exploitation.
From an operational impact perspective, this vulnerability exposes network infrastructure devices to complete takeover by remote attackers who can execute arbitrary commands with root privileges. Successful exploitation allows threat actors to establish persistent backdoors, modify system configurations, extract sensitive data including user credentials and network information, and potentially use compromised devices as launch points for further attacks within the network perimeter. The severity is amplified by the fact that these are wireless gateway devices that typically serve as primary network entry points, making them attractive targets for attackers seeking lateral movement opportunities. This vulnerability directly maps to several tactics in the MITRE ATT&CK framework including privilege escalation, persistence mechanisms, and command and control activities.
Effective mitigation strategies must address both immediate remediation and long-term security improvements. The primary solution involves applying firmware patches from the vendor that properly validate and sanitize all input parameters within the system.upgrade_check interface. Organizations should also implement network segmentation to limit access to these administrative interfaces, deploy intrusion detection systems to monitor for suspicious command execution patterns, and establish strict input validation policies across all network device management interfaces. Additional protective measures include disabling unnecessary administrative services, implementing strong authentication controls, and conducting regular security assessments of network infrastructure devices to identify similar vulnerabilities across the entire attack surface.