Critical 9.8Published Apr 7, 2026

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

Updated under an hour ago (Oct 26, 2026, 8:10 PM ET)

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It affects Beijing Topsec Network Security Technology Co., Ltd. Tianxin Internet Behavior Management System and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Beijing Topsec Network Security Technology Co., Ltd. Tianxin Internet Behavior Management System

Exploited in the last 30 days

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: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-78
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Analyzed
Record last updated: May 13, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Beijing Topsec Network Security Technology Co., Ltd. Tianxin Internet Behavior Management System beijing_topsec_network_security_technology:tianxin_internet_behavior_management_system (from the name)	before 4.0.0.7_20210716.180815	CNA record
topsecgroup tianxin_internet_behavior_management_system topsecgroup:tianxin_internet_behavior_management_system	before 4.0.0.7_20210716.180815	NVD

References

References

https://www.cnvd.org.cn/flaw/show/CNVD-2021-41972	government-resource, third-party-advisory
https://www.cnvd.org.cn/patchInfo/show/280166	patch
https://cn-sec.com/archives/4631959.html	technical-description, exploit, third-party-advisory
https://avd.aliyun.com/detail?id=AVD-2021-890232	third-party-advisory
https://www.vulncheck.com/advisories/tianxin-internet-behavior-management-system-command-injection-via-toquery-php	third-party-advisory, vdb-entry

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.