VulnTideExploited vulnerabilities, by vendor. Data as of .
Not in CISA KEVReported exploited: VulnCheck KEV since Published CVSS 9.3 criticalEPSS 6.2% probability of exploitation in 30 days
Beijing Topsec Network Security Technology Co., Ltd.

CVE-2021-4473: Tianxin Internet Behavior Management System Command Injection via toQuery.php

Is it exploited?

Reported, not confirmed by CISA. VulnCheck KEV lists it as exploited in the wild. CISA has not added it to its Known Exploited Vulnerabilities catalog as of .

VulnCheck KEV lists it since . It cites 2 public reports, the first from .

How likely is exploitation in the next 30 days?
6.2%

EPSS score, percentile 93.5 of all scored records. A probability estimated by FIRST, not a report of exploitation.

How severe?
9.3 Critical

CVSS v4.0 base score, given by the CNA

What should I do?

CISA has set no required action, because the vulnerability is not in KEV.

Advisories and patches (1)

Which versions are affected?

Affected

  • before 4.0.0.7_20210716.180815

Versions by product

Source: CISA KEV 2026.10.29, as of ; VulnCheck KEV, as of ; FIRST EPSS, as of ; CVE List, as of . About the data.

Description

Tianxin Internet Behavior Management System Command Injection via toQuery.php

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).

Source: CVE List, as of . About the data.

What to do

Advisories and patches

This summary is based on the CVE record as of . Check the vendor's advisory before you act: affected versions and fixes can change.

Affected products and versions

Versions by product, as listed in the CVE record (1 product)
Beijing Topsec Network Security Technology Co., Ltd. Tianxin Internet Behavior Management System
StatusVersions
Affectedbefore 4.0.0.7_20210716.180815

Versions not listed are: unaffected.

Source: CVE List, as of . About the data.

Weakness

CWE-78
  • CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record.

Timeline

DateEvent
CVE record published
CVE record last updated

References

4