CVE-2021-4473
CRITICAL EPSS 92.6%
Published Apr 7, 20262mo ago · Modified Jun 17, 20261w ago
9.3 CVSS 4.0
Published Apr 7, 2026 2mo ago
Last Modified Jun 17, 2026 1w ago
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).
CVSS Details
Base Score
Exploitability
Impact
Vector string
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X
Threat Intelligence
EPSS Exploit Probability
92.6% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available
Weaknesses 1
CWE-78 OS Command Injection Injection
Affected Products 1
| Vendor | Product | Version | Range |
|---|---|---|---|
| topsecgroup | tianxin_internet_behavior_management_system | * | <4.0.0.7_20210716.180815 |
References 5
- avd.aliyun.com https://avd.aliyun.com/detail?id=AVD-2021-890232
- cn-sec.com https://cn-sec.com/archives/4631959.html
- cnvd.org.cn https://www.cnvd.org.cn/flaw/show/CNVD-2021-41972
- cnvd.org.cn https://www.cnvd.org.cn/patchInfo/show/280166
- vulncheck.com https://www.vulncheck.com/advisories/tianxin-internet-behavior-management-system-command-injection-via-toquery-php
Remediation
- cnvd.org.cn https://www.cnvd.org.cn/patchInfo/show/280166