CVE-2021-4473 json
Tianxin Internet Behavior Management System Command Injection via toQuery.php
published 2026-04-07 7 mo ago modified 2026-06-17 4 mo ago also EUVD-2021-34776
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 6.3%
- EPSS 6.3% chance of exploitation in 30 days, percentile 93%
- public exploits
- 0
- none known
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).
Patch / fix
- Beijing Topsec Network Security Technology Co., Ltd. Tianxin Internet Behavior Management System 4.0.0.7_20210716.180815
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
- Assessed
- 7 mo ago
Exploit prediction
6.27% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- cn-sec.com https://cn-sec.com/archives/4631959.html referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 9.3 | 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 |
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| CNA | 4.0 | 9.3 | 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 |
Affected products
- Beijing Topsec Network Security Technology Co., Ltd. Tianxin Internet Behavior Management System
Classification
- Weakness
-
- CWE-78 Improper Neutralization of Special Elements used in an OS Command
References
-
cnvd.org.cn
/patchInfo/show/280166
patch
-
cn-sec.com
/archives/4631959.html
technical-description, exploit, third-party-advisory
-
cnvd.org.cn
/flaw/show/CNVD-2021-41972
government-resource, third-party-advisory
-
avd.aliyun.com
/detail?id=AVD-2021-890232
third-party-advisory
-
vulncheck.com
/advisories/tianxin-internet-behavior-management-system-command-injection-via-toquery-php
third-party-advisory, vdb-entry
Sources
- CVE List CVE-2021-4473
- NVD CVE-2021-4473
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.