Vulnerability details
CVE-2021-47719
COMMAX WebViewer ActiveX Control
CNC_Ctrl DllUnregisterServer f5501 Access Violation
CVSS 4.0
8.7High
Official description
COMMAX WebViewer ActiveX Control 2.1.4.5 contains a buffer overflow vulnerability that allows attackers to execute arbitrary code by providing excessively long string arrays through multiple functions. Attackers can exploit boundary errors in Commax_WebViewer.ocx to cause buffer overflow conditions and potentially gain code execution.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.7High | 4.0 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| COMMAX Co., Ltd. | COMMAX WebViewer ActiveX Control | 2.1.4.5 | CVEProject cvelistV5 (CNA) |
References and advisories
4- https://www.exploit-db.com/exploits/50231 exploit
- https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5663.php third-party-advisory
- https://www.commax.com product
- https://www.vulncheck.com/advisories/commax-webviewer-activex-control-commax-webviewer-ocx-buffer-overflow third-party-advisory
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Details
- Published
- 2025-12-10
- Last updated
- 2026-04-07
- State
- Published
- Assigner (CNA)
- VulnCheck
Exploit prediction (EPSS)
0.48%
Probability of exploitation in 30 days
42.1%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- Proof of concept
- Technical impact
- Total
Weaknesses (CWE)
- CWE-787Out-of-bounds Write