PatchTheCVECVE-2021-4473: Tianxin Internet Behavior Management System contains a command injection vulnerability in the Reporter compone
CVE-2021-4473 is a critical-severity flaw (CVSS 9.8) affecting tianxin internet behavior management system. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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 pr
Why this priority
- Critical severity
- EPSS top 7%: very likely to be exploited
- Public exploit reference
- CISA SSVC: automatable with total technical impact
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 6.2% (top 7%) |
| CISA exploited list | No |
| Weakness | CWE-78 |
| Published | 2026-04-07 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Exact fixes by distribution
Public exploits and detection
Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.
- Write-up: cn-sec.com/archives/4631959.html
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-4473?
tianxin internet behavior management system: upgrade to 4.0.0.7_20210716.180815. Exact commands for each OS are on this page.
Is CVE-2021-4473 being exploited?
CVE-2021-4473 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2021-4473 affect?
CVE-2021-4473 affects tianxin internet behavior management system. Severity is critical (CVSS 9.8). 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 containi
How urgent is CVE-2021-4473?
Priority 71/100. Critical severity; EPSS top 7%: very likely to be exploited; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action