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Vulnerability record · CVE-2021-4473 · published 7 April 2026

CVE-2021-4473: Topsecgroup tianxin internet behavior management system os command injection vulnerability

TTopsecgroup · Tianxin Internet Behavior Management System

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).

9.3 CVSS 4.0 Critical EPSS 6.2% · top 6.8% CWE-78 · OS command injection
9.3CVSS 4.0 base score
6.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References, 1 tagged exploit
17 Jun 2026Last modified by NVD

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).

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2021-4473), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.