CVE-2021-4473
9.8 · CRITICALOverview
CVE-2021-4473 is a critical-severity vulnerability affecting topsecgroup tianxin_internet_behavior_management_system. It was published on April 7, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).
This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical 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).
Remediation
Check the references section for vendor advisories and patches from topsecgroup. Update tianxin_internet_behavior_management_system to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| topsecgroup | tianxin_internet_behavior_management_system | >= 0, < 4.0.0.7_20210716.180815 | Affected |
Frequently Asked Questions
What is CVE-2021-4473?
CVE-2021-4473 is a critical-severity vulnerability affecting topsecgroup tianxin_internet_behavior_management_system. It was published on April 7, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).
How severe is CVE-2021-4473?
This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2021-4473?
Check the references section for vendor advisories and patches from topsecgroup. Update tianxin_internet_behavior_management_system to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2021-4473?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-4473 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
AI-driven PR review catches vulnerable dependencies before they ship.
Browser-based exploitation validates findings with real proof-of-concept.
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