{"id":"CVE-2021-47719","aliases":["EUVD-2021-34726","GHSA-frh6-7cwp-hqh4"],"status":"published","title":"CNC_Ctrl DllUnregisterServer f5501 Access Violation","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.","severity":{"version":"4.0","score":8.7,"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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00521,"percentile":0.44511,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-787"],"published":"2025-12-09T20:41:29Z","modified":"2026-06-17T04:18:21Z","products":[{"vendor":"commax co., ltd.","product":"commax webviewer activex control"}],"references":[{"url":"https://www.exploit-db.com/exploits/50231","tags":["exploit"]},{"url":"https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5663.php","tags":["third-party-advisory"]},{"url":"https://www.commax.com","tags":["product"]},{"url":"https://www.vulncheck.com/advisories/commax-webviewer-activex-control-commax-webviewer-ocx-buffer-overflow","tags":["third-party-advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-47719"},{"url":"https://www.vulncheck.com/advisories/cncctrl-dllunregisterserver-f-access-violation"},{"url":"https://github.com/advisories/GHSA-frh6-7cwp-hqh4"}],"sources":{"cve":[{"id":"CVE-2021-47719","title":"CNC_Ctrl DllUnregisterServer f5501 Access Violation","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.","status":"published","published":"2025-12-09T20:41:29.19Z","modified":"2026-04-07T14:05:42.247Z","cvss":[{"version":"4.0","score":8.7,"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","level":"high","assessor":"cna"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:32:56.308189Z"}],"euvd":[{"id":"EUVD-2021-34726","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.","status":"published","published":"2025-12-09T20:41:29Z","modified":"2026-04-07T14:05:42Z","cvss":[{"version":"4.0","score":8.7,"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","level":"high"}],"updated_at":"2026-11-02T19:25:13.718727Z"}],"ghsa":[{"id":"GHSA-frh6-7cwp-hqh4","title":"COMMAX WebViewer ActiveX Control 2.1.4.5 contains a buffer overflow vulnerability that allows...","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.","status":"published","published":"2025-12-09T21:31:48Z","modified":"2025-12-10T18:31:34Z","cvss":[{"version":"4.0","score":8.7,"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/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","level":"high"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T15:05:08.132589Z"}],"nvd":[{"id":"CVE-2021-47719","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.","status":"published","published":"2025-12-09T21:15:50.61Z","modified":"2026-06-17T04:18:21.38Z","cvss":[{"version":"4.0","score":8.7,"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/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","level":"high","assessor":"secondary"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:07:09.005706Z"}]}}