CVE-2021-4473
CRITICAL EXPLOITEDTianxin Internet Behavior Management System Command Injection via toQuery.php
Title source: cnaExploitation Summary
CVE-2021-4473 has been observed exploited in the wild (reported by VulnCheck KEV).
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).
References (5)
Core 5
Core References
Government Resource government-resource
https://www.cnvd.org.cn/flaw/show/CNVD-2021-41972
Patch patch
https://www.cnvd.org.cn/patchInfo/show/280166
Exploit technical-description
exploit
https://cn-sec.com/archives/4631959.html
Third Party Advisory third-party-advisory
https://avd.aliyun.com/detail?id=AVD-2021-890232
Third Party Advisory third-party-advisory
https://www.vulncheck.com/advisories/tianxin-internet-behavior-management-system-command-injection-via-toquery-php
Scores
CVSS v3
9.8
EPSS
0.0617
EPSS Percentile
92.6%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
total
Details
VulnCheck KEV
2026-04-07
CWE
CWE-78
Status
published
Products (2)
Beijing Topsec Network Security Technology Co., Ltd./Tianxin Internet Behavior Management System
< 4.0.0.7_20210716.180815
topsecgroup/tianxin_internet_behavior_management_system
< 4.0.0.7_20210716.180815
Published
Apr 07, 2026
Tracked Since
Apr 07, 2026