CVE-2021-4473 (GCVE-0-2021-4473)
Vulnerability from cvelistv5 – Published: 2026-04-07 12:50 – Updated: 2026-05-14 02:06 X_Known Exploited Vulnerability
VLAI
EPSS
VEX
Title
Tianxin Internet Behavior Management System Command Injection via toQuery.php
Summary
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).
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-08 14:45 UTC
CWE
- CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://www.cnvd.org.cn/flaw/show/CNVD-2021-41972 | government-resource |
| https://www.cnvd.org.cn/patchInfo/show/280166 | patch |
| https://cn-sec.com/archives/4631959.html | technical-descriptionexploit |
| https://avd.aliyun.com/detail?id=AVD-2021-890232 | third-party-advisory |
| https://www.vulncheck.com/advisories/tianxin-inte… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Beijing Topsec Network Security Technology Co., Ltd. | Tianxin Internet Behavior Management System |
Affected:
0 , < 4.0.0.7_20210716.180815
(custom)
|
guessed |
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