What’s Vulnerable › Vulnerabilities

CVE-2021-4473: Tianxin Internet Behavior Management System Command Injection via toQuery.php

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 6.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-04-07 · updated 2026-06-17
• Weakness: CWE-78

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).

Affected products

• Beijing Topsec Network Security Technology Co., Ltd. Tianxin Internet Behavior Management System: before 4.0.0.7_20210716.180815 — fixed in 4.0.0.7_20210716.180815

How to fix

Upgrade to a fixed version: Beijing Topsec Network Security Technology Co., Ltd. Tianxin Internet Behavior Management System 4.0.0.7_20210716.180815. Check the vendor advisory for mitigations.

References

• https://avd.aliyun.com/detail?id=AVD-2021-890232
• https://cn-sec.com/archives/4631959.html
• https://www.cnvd.org.cn/flaw/show/CNVD-2021-41972
• https://www.cnvd.org.cn/patchInfo/show/280166
• https://www.vulncheck.com/advisories/tianxin-internet-behavior-management-system-command-injection-via-toquery-php

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