CVE-2021-27708

Command Injection in TOTOLINK X5000R router with firmware v9.1.0u.6118_B20201102, and TOTOLINK A720R router with firmware v4.1.5cu.470_B20200911 allows remote attackers to execute arbitrary OS commands by sending a modified HTTP request. This occurs because the function executes glibc's system function with untrusted input. In the function, "command" parameter is directly passed to the attacker, allowing them to control the "command" field to attack the OS.

• CWE-78

• https://hackmd.io/7FtB06f-SJ-SCfkMYcXYxAExploit, Third Party Advisory
• https://hackmd.io/mDgIBvoxSPCZrZiZjfQGhwExploit, Third Party Advisory
• https://hackmd.io/7FtB06f-SJ-SCfkMYcXYxAExploit, Third Party Advisory
• https://hackmd.io/mDgIBvoxSPCZrZiZjfQGhwExploit, Third Party Advisory

Published

Apr 14, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

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