CVE-2021-4473

Tianxin Internet Behavior Management System Command Injection via toQuery.php

Published Apr 7, 2026 CVSS 4.0 · 9.3 Critical EPSS 6.3% KEV · Not listed
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

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Topsecgroup
Topsecgroup tianxin Internet Behavior Management System
CPEs cpe:2.3:a:topsecgroup:tianxin_internet_behavior_management_system:*:*:*:*:*:*:*:*
Vendors & Products Topsecgroup
Topsecgroup tianxin Internet Behavior Management System
Type Values Removed Values Added
First Time appeared Beijing Topsec Network Security
Beijing Topsec Network Security tianxin Internet Behavior Management System
Vendors & Products Beijing Topsec Network Security
Beijing Topsec Network Security tianxin Internet Behavior Management System
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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).
Title Tianxin Internet Behavior Management System Command Injection via toQuery.php
Weaknesses CWE-78
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.3, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
May 14, 2026, 2:06 AM
Reserved
Jan 15, 2026, 8:57 PM
Status
Analyzed
Published
Apr 7, 2026, 1:16 PM
Modified
Jun 17, 2026, 4:19 AM