CVE-2021-4473
In your normal cycle
Critical by CVSS (9.8), but no sign of active exploitation.
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).
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 6.17% — more likely to be exploited than 93% of all CVEs |
| Weakness | CWE-78 |
| On CISA KEV | no |
| Public exploit | none known |
| Published | 2026-04-07 |
| Last modified | 2026-06-17 |
Affected (1)
| Vendor | Product |
|---|---|
| topsecgroup | tianxin internet behavior management system |
References
- https://avd.aliyun.com/detail?id=AVD-2021-890232
- https://cn-sec.com/archives/4631959.html
- https://www.cnvd.org.cn/flaw/show/CNVD-2021-41972
- https://www.cnvd.org.cn/patchInfo/show/280166
- https://www.vulncheck.com/advisories/tianxin-internet-behavior-management-system-command-injection-via-toquery-php
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