CVE-2021-47719CWE-787

CNC_Ctrl DllUnregisterServer f5501 Access Violation

High · published December 9, 2025

CVSS v4.0
8.7
EPSS
0%
Percentile
40.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
8.7 · HIGH
Vector
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
EPSS
0.00486 · 40.9th percentile
Weakness
CWE-787 · Out-of-bounds Write
Published
2025-12-09T20:41Z
EPSS history
Timeline
  • 09 DEC 20:41Z
    CNC_Ctrl DllUnregisterServer f5501 Access Violation
    cvelistv5