CVE-2021-4473CWE-78

Tianxin Internet Behavior Management System Command Injection via toQuery.php

Critical · published April 7, 2026

CVSS v4.0
9.3
EPSS
6%
Percentile
93.5
In the wild
Unconfirmed
What it is

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).

The record
Technical detail
CVSS v4.0
9.3 · CRITICAL
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
EPSS
0.06165 · 93.5th percentile
Weakness
CWE-78 · Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Published
2026-04-07T12:50Z
EPSS history
Timeline
  • 07 APR 12:50Z
    Tianxin Internet Behavior Management System Command Injection via toQuery.php
    cvelistv5