CVE-2021-4473 Tianxin Internet Behavior Management System Command Injection via toQuery.php
Unauthenticated attackers can execute arbitrary commands via the Reporter component to achieve remote code execution on Tianxin Internet Behavior Management Systems.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-4473?
CVE-2021-4473 is a critical command injection vulnerability in Beijing Topsec Network Security Technology Co., Ltd. Tianxin Internet Behavior Management System, published on 7 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Tianxin Internet Behavior Management System contains a command injection vulnerability in the Reporter component endpoint that allows unauthenticated attackers to execute arbitrary commands by supplying a crafted objClass parameter containing shell metacharacters and output redirection. Attackers can exploit this vulnerability to write malicious PHP files into the web root and achieve remote code execution with the privileges of the web server process. This vulnerability has been fixed in version NACFirmware_4.0.0.7_20210716.180815_topsec_0_basic.bin. Exploitation evidence was first observed by the Shadowserver Foundation on 2024-06-01 (UTC).
Weakness: CWE-78
Which versions are affected by CVE-2021-4473?
It affects 1 product.
Products include Topsecgroup Tianxin Internet Behavior Management System.
How do I fix CVE-2021-4473?
No fix has been published for CVE-2021-4473 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2021-4473 being exploited?
There is no known exploitation of CVE-2021-4473 in the wild and no public exploit code.
Sources
Also known as GHSA-qr68-g3cq-vhr2.